z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

Table 28. Built-in Shell Variables (sh command) (continued)
Variable Purpose
SHELL Contains the full pathname of the current shell. It is not set by the
shell, but is used by various other commands to invoke the shell.
This is set automatically from the RACF user profile when the user
logs in.
STEPLIB Identifies a STEPLIB variable to be used in building a process
image for running an executable file. A STEPLIB is a set of private
libraries used to store a new or test version of an application
program, such as a new version of a runtime library. STEPLIB can
be set to the values CURRENT or NONE or to a list of MVS data
set names.
If STEPLIB is not set, it defaults to CURRENT, which passes on
the TASKLIB, STEPLIB, or JOBLIB allocations that are part of the
invoker’s MVS program search order environment to the process
image created for an executable file.
IBM recommends that STEPLIB be set to NONE, which indicates
you do not want a STEPLIB environment for executable files. You
can specify up to 255 MVS data set names, separated by colons,
as a list of data sets used to build a STEPLIB variable. Refer to
z/OS UNIX System Services Planning for more information about
building a STEPLIB environment.
TMOUT Contains the number of seconds before user input times out. If user
input has not been received within this length of time, the shell
ends.
TMPDIR Is the pathname of the directory being used for temporary files. If it
is not set, the z/OS shell uses /tmp.
TZ Contains the system time zone value used for displaying date and
time. You can set the TZ variable in your $HOME/.profile file used
during shell startup.
The system administrator can also define a TZ default for all shell
users in the /etc/profile file. If you are not in the same time zone,
you can set TZ yourself.
The system administrator can also define TZ for the /etc/init
process in the /etc/init.options file.
VISUAL Overrides the EDITOR environment variable in setting vi, emacs,
or gmacs editing modes (see shedit).
Automatic Conversion Shell Variables
When the shell is redirecting stdin, stout, or stderr, it will default to no automatic
conversion of tagged files, and no tagging of files created by the redirection. The
following shell variables will override this behavior:
Table 29. Shell Variables for Automatic Conversion (sh command)
Variable Purpose
_TAG_REDIR_IN=TXT Redirected stdin will override the file’s text flag (TXTFLAG),
treating it as if it were tagged as:
TXTFLAG = ON, CCSID = existing file tag CCSID
This has no effect if CCSID = 0.
sh
Chapter 2. Shell command descriptions 573