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

Table 32. tcsh Built-in Shell Variables (continued)
Variable Purpose
histdup Controls handling of duplicate entries in the history list. If
set to all only unique history events are entered in the
history list. If set to prev and the last history event is the
same as the current command, then the current
command is not entered in the history. If set to erase and
the same event is found in the history list, that old event
gets erased and the current one gets inserted. The prev
and all options renumber history events so there are no
gaps.
histfile The default location in which history -S and history -L
look for a history file. If unset, ~/.history is used. histfile
is useful when sharing the same home directory between
different machines, or when saving separate histories on
different terminals. Because only ~/.tcshrc is normally
sourced before ~/.history, histfile should be set in
~/.tcshrc instead of ~/.login.
An example:
set histfile = ~/.history
histlit If set, built-in and editor commands and the savehist
mechanism use the literal (unexpanded) form of lines in
the history list. See also the toggle-literal-history editor
command.
history The first word indicates the number of history events to
save. The optional second word indicates the format in
which history is printed; if not given, %h\t%T\t%R\n is
used. The format sequences are described below under
prompt. (Note that %R has a variable meaning). Set to
100 by default.
home Initialized to the home directory of the invoker. The
filename expansion of ~ refers to this variable.
ignoreeof If set to the empty string or 0 and the input device is a
terminal, the end-of-file command (usually generated by
the user by typing ^D on an empty line) causes the shell
to print ’Use ″logout″ to leave tcsh.’ instead of exiting.
This prevents the shell from accidentally being killed. If
set to a number n, the shell ignores n - 1 consecutive
end-of-files and exits on the nth. If unset, 1 is used. That
is, the shell exits on a single ^D.
implicitcd If set, the shell treats a directory name typed as a
command as though it were a request to change to that
directory. If set to verbose, the change of directory is
echoed to the standard output. This behavior is inhibited
in non-interactive shell scripts, or for command strings
with more than one word. Changing directory takes
precedence over executing a like-named command, but it
is done after alias substitutions. Tilde and variable
expansions work as expected.
inputmode If set to insert or overwrite, puts the editor into that input
mode at the beginning of each line.
tcsh
Chapter 2. Shell command descriptions 659