extattr - Set, reset, and display extended attributes for files
extattr sets, resets, and displays extended attributes for files.
- When this attribute is set (+a) on an executable program file (load
module), it behaves as if loaded from an APF-authorized library. For example, if this program is
exec()ed at the job step level and the program is linked with the AC=1 attribute, the program will
be executed as APF-authorized.
To be able to use the extattr command for the +a option, you must have at least read access to the BPX.FILEATTR.APF resource in the FACILITY class profile. For more information about BPX.FILEATTR.APF, see z/OS UNIX System Services Planning.
- When this attribute is set (+l) on an executable program file (load
module), it will be loaded from the shared library region.
To be able to use the extattr command for the +l option, you must have at least read access to the BPX.FILEATTR.SHARELIB resource in the FACILITY class. For more information about BPX.FILEATTR.SHARELIB, see z/OS UNIX System Services Planning.Note: l is a lowercase L, not an uppercase i.
- When this attribute is set (+p) on an executable program file (load
module), it causes the program to behave as if an RDEFINE had been done for the load module to the
PROGRAM class. When this program is brought into storage, it does not cause the environment to be
To be able to use the extattr command for the +p option, you must have at least read access to the BPX.FILEATTR.PROGCTL resource in the FACILITY class. For more information about BPX.FILEATTR.PROGCTL , see z/OS UNIX System Services Planning.
- When this attribute is not set (-s), the _BPX_SHAREAS=YES and _BPX_SHAREAS=REUSE environment variable settings are ignored when the file is spawn()ed. Use of the _BPX_SHAREAS=MUST setting and the -s option will result in a spawn() failure. By default, this attribute is set (+s) for all executable files.
- -F format file ...
- extattr command will accept the -F option flag with values
consistent with the cp command to indicate the format of the file. The
command will set the file format accordingly.
Setting the file format flag on a file does not modify the data in the file. Use the ls -H to display the file format.For format, you can specify:The file format flag (-F) can be used with other extattr flags (+alps/-alps), but it must be separated by a space or tab. For example:
- Binary data
- Carriage return
- Carriage return followed by line feed
- Carriage return followed by a newline character
- Line feed
- Line feed followed by carriage return
- Not specified
- Newline character
- File data consists of records with prefixes. The record prefix contains the length of the record that follows.
- extattr +aps -F BIN file is a valid entry.
- extattr -apsF NA file is not a valid entry.
The APF-authorized (a), shared library (l) and program-control (p) attributes are reset by the system if the file is opened for write, an external link to the file is created, or the file is renamed.
extattr +ap -F BIN -sl <filename> extattr -F NA -aps +l <filename> extattr -FCRnl <filename>
extattr -s /bin/c89 /bin/tso
chtag, ls, ISHELL