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

COLUMNS
Contains the number of columns between the left and right margins (see
option variable wrapmargin). This is also used as the horizontal screen
size.
ENV Contains the pathname of a file containing KornShell commands. When you
invoke sh, it executes this file before doing anything else.
EXINIT
Contains a list of vi commands to be run when the editor is started up.
HOME Contains the directory to be searched for the editor startup file.
LINES Contains the number of lines in a screenful (see option variable windows).
This is also used as the vertical screen size.
PATH Contains a list of directories to be searched for the shell command specified
in the ex commands read, write, and shell.
SHELL
Contains the name of the command interpreter for use in !, shell, read,
write, and other ex commands with an operand of the form !string. The
default is the sh utility.
TERM Contains the name of the terminal type.
TERMINFO
Contains the pathname of the terminfo database.
TMPDIR
Contains the pathname that the shell uses as the directory for temporary
files.
TMP_VI
Contains a directory pathname that can be specified by an administrator as
a location for vi’s temporary files. This is useful if the current default
directory for these files (usually /tmp) is implemented as a TFS. In this
case, all vi’s temporary files that the exrecover daemon uses for recovery
would be gone after a system crash.
We recommend that this environment variable be set by a system
administrator as opposed to a user setting it for their environment. If the
latter occurs, and the user sets the TMP_VI directory to something different
than what exrecover recognizes as TMP_VI, the user will need to run the
exrecover daemon manually to allow the temporary files to be converted to
the recoverable files used by vi (located in /etc/recover/$LOGNAME).
Note: A system administrator should NOT set TMP_VI to
/etc/recover/$LOGNAME. Also, the administrator should not set
TMP_VI to any directory where a pathname component is an
environment variable with a user’s value different than the init
process’s value (eg. $HOME). vi’s temporary files are converted into
a form recoverable by vi when exrecover is run during IPL. Since
exrecover is issued during IPL, it is owned by the init process and
will therefore contain different values for certain environment
variables, if those environment variables are set. Throughout the file
system, there may exist some temporary files that can only be
converted by exrecover. This conversion can be done manually by a
system administrator (to recover files owned by all users) or by a
single user (to recover only their own files).
vi
Chapter 2. Shell command descriptions 785