assign(1)
assign - Assigns options for library file open processing
As shipped in IRIX 6.5.7. Last changed in IRIX 6.5.5.
NAME assign - Assigns options for library file open processing SYNOPSIS UNICOS and UNICOS/mk systems: assign [-a actualfile] [-b bs] [-c] [-d bdr] [-f fortstd] [-l buflev] [-m setting] [-n sz [:st]] [-p partlist] [-q ocblks] [-r setting] [-s ft] [-t] [-u bufcnt] [-w setting] [-x setting] [-y setting] [-C charcon] [-D fildes] [-F spec[,specs]] [-I] [-L setting] [-N numcon] [-O] [-P scope] [-R] [-S setting] [-T setting] [-U setting] [-V] [-W setting] [-Y setting] [-Z setting] assign_object IRIX systems: assign [-a actualfile] [-b bs] [-f fortstd] [-s ft] [-t] [-y setting] [-B setting] [-C charcon] [-D fildes] [-F spec[,specs]] [-I] [-N numcon] [-O] [-R] [-S setting] [-T setting] [-U setting] [-V] [-W setting] [-Y setting] [-Z setting] assign_object IMPLEMENTATION UNICOS, UNICOS/mk, and IRIX systems DESCRIPTION On IRIX systems, the assign command affects I/O statements in program units compiled with the MIPSpro 7 Fortran 90 compiler or compiled with the -craylibs option to the MIPSpro F77 compiler. The assign command associates options with Fortran unit numbers and file names for use during the library open processing. The ffassign(3C) command provides an interface to assign processing from C. See the ffassign(3C) man page for more details. When using direct access files on IRIX systems, the user must assign the file to either the system or global layer for code that works with more than one processor. The default layer for direct access on IRIX systems is the cache layer and it does not have the coherency to handle multiple processes doing I/O to the same file. Selected options on the assign command are available on IRIX systems. The descriptions of each option include the hardware platform where the option is available. The assign_object argument can take one of the following formats: ------------------------------------------------------------- Format Example Attribute association ------------------------------------------------------------- g:io_type g:su Sequential unformatted open request u:unit_number u:9 Fortran unit 9 p:pattern p:file% File names matching the pattern file% f:file_name f:file1 File name file1 file_name myfile File name myfile ------------------------------------------------------------- An assign_object that is a pattern may contain wildcard characters % and _. The % character matches any sequence of 0 or more characters; the _ character matches any single character. The run-time I/O library applies the options to a file connection whenever assign_object is opened. The application of options occurs whenever a file is opened by any of the following: * Fortran I/O Fortran OPEN statement Implicit Fortran open via some I/O statement * FFIO ffopen(3C) library routine fdcp(1) command * Fortran auxiliary I/O WOPEN(3F) library routine OPENMS(3F) library routine OPENDR(3F) library routine AQOPEN(3F) library routine When any of these I/O routines opens a file, they use assign options for any assign_object which applies to the open request. As many as five assign_objects can apply to an open request: * g:all applies to any open. * g:su, g:sf, g:du, g:df, g:aq, and g:ff each apply to types of open requests (for example, Fortran sequential unformatted, Fortran sequential formatted, Fortran direct unformatted, Fortran direct formatted, AQOPEN, and ffopen, respectively). * u:N applies whenever Fortran unit N is opened. * p:pattern applies whenever a file with a name matching pattern is opened. The assign environment can contain only one p:assign_object that matches the current open. The exception is that the p:% pattern is silently ignored if a more specific pattern also matches the current filename being opened. * f:filename applies whenever a file with the name filename is opened. Options from the assign_objects in the above categories are collected to create the complete set of options used for any particular open operation. The options are collected in the above order, with options collected later in the list of assign_objects overriding those collected earlier. On UNICOS and UNICOS/mk systems, assign information is stored in the assign environment file, $TMPDIR/.assign, by default. The location of the active assign environment can be changed by assigning a file name or a process environment variable to the FILENV environment variable. On IRIX systems, you must set the FILENV environment variable to use the assign command. FILENV can contain the pathname of a file which will be used to store assign information, or it can specify that the information should be stored in the process environment. See the examples in the EXAMPLE section. There are two main groups of assign command options: control options and I/O processing options. This man page describes both types of options. Control options These options are available on IRIX systems and UNICOS and UNICOS/mk systems: -I Specifies an incremental assign. All options are added on to the options already assigned to the current assign_object. This option and the -O option are mutually exclusive. -O Specifies a replacement assign. All currently existing assign options for the current assign_object are replaced. This option is the default control option and is mutually exclusive from the -I option. -R Removes all assign options for assign_object. If assign_object is not specified, all currently assigned options for all assign_objects are removed. -V Views options for assign_object. If assign_object is not specified, all currently assigned options for all assign objects are printed. I/O processing options I/O processing options specify aspects of I/O processing. Each option applies to one or more supported I/O type: Fortran I/O, FFIO, or Fortran auxiliary I/O (AQIO, WAIO, DRIO, and MSIO). The special "default" option value is available for all assign attribute options with the exception of the -a option. The "default" option value has the same effect as if the corresponding option were unspecified. It can be used to nullify an option value set in a more general type of assign. For example, the following commands show how you can set a buffer size of 20 blocks for all files except the file smallfile: assign -b 20 g:all assign -b default f:smallfile Options and Arguments -a actualfile Specifies the actual file name. Used by Fortran I/O and auxiliary I/O. Available on IRIX systems. When the -a option is assigned to a unit, open processing for the unit results in a connection to actualfile. An error occurs if -a has been specified for a unit that is opened with an explicit FILE= specifier in the OPEN statement. When -a is assigned to a file name, the file name becomes an alias for actualfile. When file_name is specified as the FILE= specifier in an OPEN statement, actualfile is opened instead of file_name. A similar effect occurs if the ln(1) command is used to establish a symbolic link. The -a and -D options cannot both be provided. -b bs Specifies buffer size of the library's I/O buffer in units of 4096-byte blocks. Used by Fortran I/O and auxiliary I/O. Available on IRIX systems. On UNICOS and UNICOS/mk systems, the default buffer sizes in 4096-byte blocks are as follows. Sequential formatted 8 Sequential unformatted 48 (see the description of the cos layer in the INTRO_FFIO(3F) man page for details) Direct access formatted Minimum (record length + 1 byte, 8 blocks) Direct access Maximum (record length, 8 blocks) unformatted Direct access unformatted files have 4 buffers. On IRIX systems, the default buffer sizes in 4096-byte blocks are as follows: Sequential formatted 8 Sequential unformatted 8 Direct access formatted 16 Direct access 16 unformatted Direct files have 4 buffers. -c Specifies contiguous storage. Must be used in conjunction with the -n option. Used by Fortran I/O and auxiliary I/O. Deferred implementation on IRIX systems. Requests that contiguous disk space be allocated to the file. -d bdr Specifies automatic recovery of bad data for online tape files. Used by Fortran I/O and auxiliary I/O. Deferred implementation on IRIX systems. Valid values for bdr are as follows: bdr Action skipbad Skips bad data; no bad data is sent to your buffer. acptbad Accepts bad data; makes bad data available. When this option is used, explicit calls to the ACPTBAD and SKIPBAD library routines are not necessary. You will receive an error code indicating that a bad tape block has been encountered. This option is valid only for online tape files. For online tape files specified with assign -F [bmx,tape] or assign -s [bmx,tape], only one tape block is accepted or skipped at a time. The -d skipbad option is also valid for tape fields specified with the following command: assign -F [ibm.u, ibm.vbs, ibm.vb, ibm.v,tape] For these files, all consecutive bad tape blocks are skipped, and the user is placed at the beginning of the next record. The -d option is invalid with all other file specifications. -f fortstd This option specifies the type of Fortran with which to be compatible. Used by Fortran I/O. Valid values for fortstd are: 77 Causes the Fortran file to be compatible with the FORTRAN 77 standard and Cray Research's CF77 compiling system. 90 Causes the Fortran file to be compatible with ANSI X3.198-1991 (Fortran 90 and the Fortran 95 standard) and Cray Research's CF90 compiling system. irixf77 Causes the Fortran file to be compatible with Silicon Graphics' FORTRAN 77 compiling system which runs on IRIX systems. irixf90 Causes the Fortran file to be compatible with the MIPSpro 7 Fortran 90 compiling system. A file's compatibility is established at open time. By default, a Fortran file is compatible with the language from which an OPEN statement or implicit open caused the file to be connected. Implicit opens which result from calls to READC, READCP, WRITEC, or WRITECP result in Fortran 90/95 compatibility mode by default. -l buflev Controls kernel buffering; used by Fortran I/O, auxiliary I/O, and FFIO. Deferred implementation on IRIX systems. buflev can be any of these values: none Sets O_RAW and O_LDRAW ldcache Sets O_RAW, clear O_LDRAW full Clears O_RAW and O_LDRAW If this option is not set, the level of system buffering is dependent on the type of open operation being performed. -m setting Activate or suppress special handling of a file which will be accessed concurrently by several processes or tasks. Used by Fortran I/O and auxiliary I/O. Not available on IRIX systems. Special handling includes skipping the check that only one Fortran unit be connected to a unit. setting can be on or off. For files which are written, special handling also includes: * Suppressing file truncation to true size by the I/O buffering routines. Library buffer routines are usually flushed to disk in their entirety, and a truncation of the file at close time is done to trim the last file page to the correct size. * Ensuring that the file will not be truncated after the last record written on sequential files (-m on implies -T off). If the file will be updated, the user is responsible for partitioning file access from all processes, tasks, or processing elements (PE) on library buffer page boundaries. This can be done in the following ways: * Specify the -b assign option. * Specify the first numeric parameter on the cache or bufa FFIO layers (for example, -F cache:2 or -F bufa:8). * Specify no library buffering by using the -F system option. For example, if several PEs concurrently open a file and specify -m on, each PE might by convention update region MY_PE() of the file. If the region size for each PE is 10 blocks, the following assign options could be specified: assign -m on -F cache:5 u:1 Specifying a buffer page size of 5 in this example assures alignment with PE file region boundaries because the region size (10) is an integral multiple of the buffer page size (5). -n sz [:st] Amount of system file space to reserve for a file. This is a number of 4096-byte blocks. Used by Fortran I/O, FFIO, and auxiliary I/O. Deferred implementation on IRIX systems. If this option is used with an existing file, sz 4096-byte blocks are added to the end of the file by use of ialloc(2). NOTE: Allocation of actual file space is not done until the file is opened in the Fortran libraries. For immediate allocation, use the setf(1) command . The optional st value is an obsolete way to specify the -q assign option. Use of -q is preferable to using the st value on -n. -p partlist File system partition list. Used by Fortran I/O, FFIO, and auxiliary I/O. partlist indicates the partitions of a file system on which a file is to be allocated. Deferred implementation on IRIX systems. partlist is used at file creation time by use of the cbits argument on the open(2) system call. partlist also controls the partitions where space is allocated using ialloc(2) when a -n option is assigned. partlist can be a single number, a range (m-n), a set (m:n), or a combination of ranges and sets separated by colons. The dash (-) in the range specifies a range of partitions to be used (for example, 2-5 means partitions 2 through 5). A colon (:) in the set specifies a list of partitions to be used (for example, 2:4:6 means partitions 2, 4, and 6). Partitions are numbered starting with 0. You can use the df(1) command with the -p option to display partitions on one or more file systems. -q ocblks Number of 4096-byte blocks to be allocated per file system partition. Used by Fortran I/O, FFIO, and auxiliary I/O. ocblks is used at file creation time by use of the cblks argument on the open(2) system call. ocblks also controls the number of blocks assigned per partition where space is allocated using ialloc(2) when a -n option is assigned. Deferred implementation on IRIX systems. -r setting Activates or suppresses the passing of the O_RAW flag to the open(2) system call. Used by Fortran I/O and FFIO. setting can be either on or off. This option is supported in programs linked with Cray Research's Programming Environment 3.0 and later releases. Not available on IRIX systems. -s ft Specifies the file type. Used by Fortran I/O. See below for specific values supported on IRIX systems. The file type defines the way records are delimited and how end-of-file is represented. Some ft values also define the internal processing used for a file. Enter one of the following for ft: ft File Type bin Unblocked file structure with buffering. Available on IRIX systems. cos or blocked COS blocked structure. This is the default structure for sequential unformatted files on UNICOS and UNICOS/mk systems. Available on IRIX systems. sbin Unblocked file structure with "stdio" style buffering. The Fortran I/O library issues I/O which is compatible with the C fwrite(3C) and fread(3C) functions. This file type is useful for accessing pipe files. It is not permitted with formatted files. Available on IRIX systems. tape or bmx On UNICOS systems and UNICOS/mk systems, this indicates the online tape access method. This file structure is required for doing any type of Fortran I/O (formatted, unformatted, or buffer I/O) to an online tape file. Each read or write request results in the processing of one tape block. This structure may be used only with online IBM-compatible tape files or with ER90 volumes mounted in block mode on UNICOS systems (see the Tape Subsystem User's Guide, for more information about restrictions on record sizes when using ER90 block mode). Not available on IRIX systems. text New-line characters delimit the records. This is the default structure for sequential formatted files. On UNICOS and UNICOS/mk systems, it is also the default structure for direct-access formatted files. Available on IRIX systems. u Each read or write request results in an immediate system call. Requests should be made in multiples of 4096 bytes for best performance. Available on IRIX systems. unblocked Adjacent records are not delimited from one another. This is the default structure for direct-access unformatted files. On IRIX systems, it is also the default structure for direct-access formatted files. Available on IRIX systems. Each file type has a set of valid access methods associated with it. The following table lists the valid access methods for each of the file types. In this table, "yes" indicates that the access method is allowed; "no" indicates that it is not allowed; "default"indicates that it is the default method on UNICOS, UNICOS/mk, and IRIX systems. -------------------------------------------------------------- Sequential Sequential Direct Direct formatted unformatted formatted unformatted -------------------------------------------------------------- bin No Yes Yes Yes cos|blocked Yes Yes ** No No sbin Yes Yes Yes Yes text Default No Yes ** No u No Yes Yes Yes unblocked No Yes Yes *** Default tape|bmx* Yes * Yes * No * No * -------------------------------------------------------------- * Not available on IRIX systems ** Default on UNICOS and UNICOS/mk systems *** Default on IRIX systems -t Temporary file. Used by Fortran I/O. Available on IRIX systems. This causes the file to be deleted when it is disconnected by using a CLOSE statement or at program termination. Unlike STATUS='SCRATCH' on OPEN, the -t option does not affect the default file name selected for a unit. If STATUS='KEEP' is specified on the CLOSE statement, it is silently ignored without error or warning. -u bufcnt Buffer count. Used by Fortran I/O. Deferred implementation on IRIX systems. Specifies the number of buffers to be allocated for a file. This option can be used with direct-access unformatted files and with online tape files (UNICOS and UNICOS/mk systems). The default is 4 for direct-access unformatted files and is system-dependent for online tape files. -w setting Activate or suppress the passing of the O_WELLFORMED flag to the open(2) system call. Used by Fortran I/O and FFIO. setting may be on or off. Deferred implementation on IRIX systems. -x setting Activate or suppress the passing of the O_PARALLEL flag to the open(2) system call. Used by Fortran I/O and FFIO. setting may be on or off. This option is supported in programs linked with Cray Research's Programming Environment 3.0 and later releases. Not available on IRIX systems. -y setting Suppress repeat count in list-directed output. setting can be on or off. The default setting is off. -B setting Activate or suppress the passing of the O_DIRECT flag to the open(2) system call. Used by Fortran I/O and FFIO. setting may be on or off. Available only on IRIX systems. Not available on UNICOS or UNICOS/mk systems. This option is supported by the cache, cachea, and system layers (see the -F option). Use of -B with the system layer requires that the user properly align their I/O requests. The cache and cachea layers will guarantee proper alighment when -B is specified. See the open(2) man page for more information about O_DIRECT. -C charcon Specifies character set conversion. Used by Fortran I/O. This requests that certain I/O processors (currently limited to the Fortran I/O libraries) convert character data from this assumed character set on input and convert it to this character set on output. charcon must be one of the following: ascii (no-op) ebcdic * cdc * * Not supported on UNICOS/mk or IRIX systems. -D fildes Specifies connection to a standard file. Used by Fortran I/O. Available on IRIX systems. The -D and -a options cannot be used together. Enter one of the following for fildes: fildes File stdin Connect to file descriptor 0 stdout Connect to file descriptor 1 stderr Connect to file descriptor 2 -F spec[,spec...] FFIO specification. This is a comma-separated list of layers through which data is to be passed. Used by Fortran I/O, auxiliary I/O, and FFIO. See the INTRO_FFIO(3F) man page for details about the FFIO specifications and for details on which layers are available on IRIX systems. Each layer specification is of the following general form: class[.type[.subtype]][:[num1]:[num2]:[num3]] For each class, class specifies the class of processing to be done. Many class values also accept type and/or subtype fields to modify their behavior; other class values accept only the class itself (for example, syscall). Following the type and subtype fields, many classes accept numeric fields to further tune or modify the file processing. Units in these numeric fields differ depending on class. All specification lists end, either implicitly or explicitly, with the system layer. If this layer is not specified, it is added automatically. Acceptable values for class are as follows: class Value blankx or blx Blank compression filters. Not available on IRIX systems. bmx or tape Online tape handlers. Deferred implementation on IRIX systems. bufa Buffering layer. Available on IRIX systems. c205 CDC CYBER 205/ETA record formats. Not available on IRIX systems. cache Cache layer. Available on IRIX systems. cachea Asynchronous cache layer. Available on IRIX systems. cdc CDC 60-bit record format. Not available on IRIX systems. cos or blocked COS blocking; default for Fortran sequential unformatted I/O on UNICOS and UNICOS/mk systems. Available on IRIX systems. er90 ER90 handlers. Not available on IRIX systems or on CRAY T3E systems. event Event layer, used to monitor I/O activity between layers. This layer generates statistics in the form of an ASCII log file. Deferred implementation on IRIX systems. f77 FORTRAN 77/UNIX Fortran record blocking. Available on IRIX systems. This is the default structure for sequential unformatted files on IRIX systems. fd Open a specific file descriptor. Available on IRIX systems. global UNICOS/mk and IRIX shared file. This is a caching layer which distributes the cache across all PEs. See the INTRO_FFIO(3F) man page for more details. ibm IBM record formats. Deferred implementation on IRIX systems. mr Memory-resident files. Deferred implementation on IRIX systems. nosve CDC NOS/VE record formats. Not available on IRIX systems. null Syntactic no-op. Available on IRIX systems. sds SDS-resident files. Not supported on CRAY T3E systems. Not available on IRIX systems. site Site-specific layer. Available on IRIX systems. stdin, stdout, or stderr Open file descriptors 0, 1, or 2, respectively (see fd layer). Available on IRIX systems. syscall System call I/O. Available on IRIX systems. system Generic system layer. Available on IRIX systems. text Special character-terminated record. Available on IRIX systems. tmf IRIX tape management facility. Available on IRIX systems. user User layer. Available on IRIX systems. vms VAX/VMS record format. Available on IRIX systems. For more information on the classes, see the INTRO_FFIO(3F) man page. -L setting Activate or suppress the passing of the O_LDRAW flag to the open(2) system call. Used by Fortran I/O and FFIO. setting may be on or off. This option is supported in programs linked with Cray Research's Programming Environment 3.0 and later releases. Not available on IRIX systems. -N numcon Specifies foreign numeric conversion. Used by Fortran I/O. Fortran unformatted I/O converts numeric data from this assumed numeric format on input, and converts it to this numeric format on output. If this option is used and the -C option is not used, appropriate character defaults are used. Each value for numcon selects a particular type of foreign data conversion. Each option has a mapping that associates each of the native data types with a corresponding foreign data type and length in bits. Appropriate data conversion is done on unformatted input and output operations. For example, entering -N ibm selects the following mapping: CRI Data Type IBM Data Type 64-bit INTEGER 32-bit INTEGER*4 64-bit REAL 32-bit REAL*4 128-bit DOUBLE 64-bit DOUBLE PRECISION 128-bit COMPLEX 64-bit COMPLEX 64-bit LOGICAL 32-bit LOGICAL*4 8-bit ASCII CHARACTER 8-bit EBCDIC CHARACTER Short INTEGER*2 16-bit INTEGER*2 The following tables list the values for numcon on different hardware platforms. Note that in these tables, "VAX" is an alias for "VMS". For example, vms_dp is synonymous with vax_dp. Cray PVP systems (non-IEEE) --------------------------------------------------- -C -N option default Meaning --------------------------------------------------- none none No data conversion default default No data conversion cray ASCII No data conversion ibm EBCDIC IBM data conversion ibm_dp EBCDIC IBM data conversion; floating-point is 64-bits CDC cdc CDC 60-bit data conversion nosve ASCII CDC NOS/VE data conversion c205 ASCII CDC CYBER 205 (ETA) data conversion vms ASCII VAX/VMS data conversion vms_dp ASCII VAX/VMS data conversion; floating-point is 64-bits ieee ASCII Generic 32-bit IEEE data conversion ieee_32 (alias for above) ieee_dp ASCII IEEE data conversion; floating-point is 64-bits mips ASCII SGI MIPS IEEE data conversion (128-bit floating-point is "double double" format) ieee_64 ASCII CRAY 64-bit IEEE data conversion ieee_le ASCII Little endian 32-bit IEEE data conversion ultrix (alias for above) ieee_le_dp ASCII Little endian 32-bit IEEE data conversion; floating- point is 64-bits ultrix_dp (alias for above) t3e ASCII CRAY 64-bit IEEE data conversion; denormalized numbers flushed to zero t3d (alias for above) user ASCII User defined data conversion site ASCII Site defined data conversion --------------------------------------------------- Cray MPP systems --------------------------------------------------- -C -N option default Meaning --------------------------------------------------- none none No data conversion default default No data conversion cray ASCII No data conversion ieee ASCII Generic 32-bit IEEE data conversion ieee_32 (alias for above) t3e ASCII CRAY 64-bit IEEE data conversion; denormalized numbers flushed to zero t3d ASCII No data conversion user ASCII User defined data conversion site ASCII Site defined data conversion --------------------------------------------------- CRAY T90/IEEE --------------------------------------------------- -C -N option default Meaning --------------------------------------------------- none none No data conversion default default No data conversion cray ASCII No data conversion ibm EBCDIC IBM data conversion ibm_dp EBCDIC IBM data conversion; floating-point is 64-bits ieee ASCII Generic 32-bit IEEE data conversion ieee_32 (alias for above) ieee_dp ASCII IEEE data conversion; floating-point is 64-bits ieee_64 ASCII CRAY 64-bit IEEE data conversion user ASCII User defined data conversion site ASCII Site defined data conversion --------------------------------------------------- SGI IRIX (MIPS) --------------------------------------------------- -C -N option default Meaning --------------------------------------------------- none none No data conversion default default No data conversion cray ASCII Cray PVP (non-IEEE) data conversion mips ASCII No data conversion user ASCII User defined data conversion site ASCII Site defined data conversion ieee ASCII Generic 32-bit IEEE data conversion ieee_32 (alias for above) ieee_64 ASCII CRAY 64-bit IEEE data conversion ieee_le ASCII Little-endian 32-bit IEEE data conversion vax ASCII DEC VAX/VMS data conversion vms (alias for above) --------------------------------------------------- -P scope Specifies the scope of a Fortran unit. Used by Fortran I/O and auxiliary I/O. Deferred implementation on IRIX systems. Allows specification of private I/O on UNICOS systems. Valid values for scope are: private Causes a Fortran unit to be private to a task. Any unit number assigned this option is visible only to the task which opens it. Other tasks may open the same unit number to the same or different files. global Supported on UNICOS systems only. Causes a Fortran unit to be global to an application. An application is defined as a process or multitasked group on UNICOS systems. thread Supported on UNICOS systems only. Causes a Fortran unit to be private to a multitasking thread. Any unit number assigned this option is visible only to the thread which opens it. Other threads may open the same unit number to the same or different files. The default for all Fortran units is -P private on UNICOS/mk systems and -P global on UNICOS systems. -P private may not be specified on UNICOS systems for a unit connected to stdin, stdout, or stderr. The following command selects private I/O for all Fortran units except scratch units, and stdin, stdout, and stderr: assign -P private p:% -S setting Suppress use of comma as a separator in list-directed output. setting can be either on or off. The default setting is off. -T setting Activates or suppresses truncation after write for sequential Fortran files. Used by Fortran I/O. Available on IRIX systems. The selection of -T on is standard and is the default setting for most file types. Selecting -T off is useful in applications where GETPOS and SETPOS are used to simulate random access to a file with sequential I/O. The following table describes the -T option settings allowed for the file types specified with the -s option. Unsupported combinations are diagnosed when a Fortran unit is opened. ----------------------------------------- File type -T on -T off ----------------------------------------- bin Allowed Default cos or blocked Default Not allowed sbin Default Allowed tape or bmx Default Not allowed text Default Allowed u Allowed Default unblocked Default Allowed ----------------------------------------- FFIO layers specified with the -F option vary in their support for suppressing truncation with -T off. -U setting Produce a non-UNICOS form of list-directed output. setting can be either on or off. This setting is a global setting which sets the value for the -y, -S, and -W options all to the same value. The default setting is off. -W setting Suppress compressed width in list-directed output. setting can be either on or off. The default setting is off. -Y setting Skip unmatched namelist group in the namelist input record. setting can be either on or off. The default setting on UNICOS and UNICOS/mk systems is off. The default setting on IRIX systems is on. -Z setting Recognize -0.0 for IEEE floating point systems. setting can be either on or off. This option recognizes -0.0 for IEEE floating point systems and writes the minus sign for edit-directed, list-directed, and namelist output. The minus sign is suppressed by default on IRIX systems. The following example suppresses the write of the minus sign for -0.0 for unit 9 on an IEEE floating point system: assign -Z on u:9 The minus sign is suppressed for IRIX systems to prevent problems from hardware instructions and optimizations which may return a -0.0 from a 0.0 value. ENVIRONMENT VARIABLES The FILENV environment variable must be set to use the assign command on IRIX systems. On UNICOS systems, FILENV does not have to be set. EXAMPLES Example 1: The following example assigns an actual name (/tmp/foo/filexyz) and a buffer size of 8 sectors to unit 1, removing any previously assigned options to unit 1: assign -a /tmp/foo/filexyz -b 8 u:1 Example 2: To assign unit 11 an unblocked file structure without modifying any other options currently in effect for unit 11, use the -I option as follows: assign -I -s unblocked u:11 Example 3: The following example sets up and uses the assign environment file, afile, for a specific program. The assign command specifies that all files with the names matching the BLOCKED% pattern are COS blocked files: env FILENV=afile assign -F cos p:BLOCKED% env FILENV=afile a.out Example 4: Attributes may be stored in the process environment using the assign or asgcmd commands. The following example uses the assign command: setenv FILENV \$EVAR eval `assign -F f77 foo` The following example uses the asgcmd command: eval `asgcmd -F f77 foo` SEE ALSO asgcmd(1), df(1), ln(1), setf(1), tpmnt(1), write(1) ialloc(2), open(2) in the acptbad(3F), assign(3F), ffassign(3C), ffopen(3C), fread(3C), intro_ffio(3F), openms(3F), opendr (see openms(3F)), skipbad(3F) Application Programmer's I/O Guide This man page is available only online.