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

tcsh
v The autologout shell variable can be set to log out of the shell after a given
number of minutes of inactivity.
v The mail shell variable can be set to check for new mail periodically.
v The printexitvalue shell variable can be set to print the exit status of commands
which exit with a status other than zero.
v The rmstar shell variable can be set to ask the user, when rm * is typed, if that
is really what was meant.
v The time shell variable can be set to execute the time built-in command after the
completion of any process that takes more than a given number of CPU
seconds.
v The watch and who shell variables can be set to report when selected users log
in or out, and the log built-in command reports on those users at any time.
National language system report
When using the system’s NLS, the setlocale function is called to determine
appropriate character classification and sorting. This function typically examines the
LANG and LC_CTYPE environment variables; refer to the system documentation
for further details.
Unknown characters (those that are neither printable nor control characters) are
printed in the format \nnn.
The version shell variable indicates what options were chosen when the shell was
compiled. Note also the newgrp built-in and echo_style shell variable and the
locations of the shell’s input files (see “tcsh files” on page 671).
The tcsh shell currently does not support 3 locales. They are IBM-1388 (Chinese),
IBM-933 (Korean) and IBM-937 (Traditional Chinese).
Signal handling
Login shells ignore interrupts when reading the file ~/.logout.The shell ignores quit
signals unless started with -q. Login shells catch the terminate signal, but non-login
shells inherit the terminate behavior from their parents. Other signals have the
values which the shell inherited from its parent.
In shell scripts, the shell’s handling of interrupt and terminate signals can be
controlled with onintr, and its handling of hangups can be controlled with hup and
nohup.
The shell exits on a hangup (see also the logout shell variable). By default, the
shell’s children do too, but the shell does not send them a hangup when it exits.
hup arranges for the shell to send a hangup to a child when it exits, and nohup
sets a child to ignore hangups.
Terminal management
The shell uses three different sets of terminal (tty) modes: edit, used when editing,
quote, used when quoting literal characters, and execute, used when executing
commands. The shell holds some settings in each mode constant, so commands
which leave the tty in a confused state do not interfere with the shell. The shell also
matches changes in the speed and padding of the tty. The list of tty modes that are
kept constant can be examined and modified with the setty built-in. Although the
editor uses CBREAK mode (or its equivalent), it takes typed-ahead characters
anyway.
652 z/OS V1R9.0 UNIX System Services Command Reference