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

tcsh
up-history (up-arrow, ^P)
Copies the previous entry in the history list into the input buffer. If histlit is
set, uses the literal form of the entry. May be repeated to step up through
the history list, stopping at the top.
vi-search-back (?)
Prompts with ? for a search string (which may be a glob-pattern, as with
history-search-backward), searches for it and copies it into the input
buffer. The bell rings if no match is found. Hitting return ends the search
and leaves the last match in the input buffer. Hitting escape ends the
search and executes the match. vi mode only.
vi-search-fwd (/)
Like vi-search-back, but searches forward.
which-command (M-?)
Does a which (built-in command) on the first word of the input buffer.
which displays the command that will be executed by the shell after
substitutions and path searching. The displayed command has passed
access checks by the security product based on the effective ids of the
user.
Command syntax
The tcsh shell splits input lines into words at blanks and tabs. The special
characters ’&’, ’|’, ’;’, ’’, ’(’, and ’)’ and the doubled characters ’&&’, ’||’, ’’ are always separate words, whether or not they are surrounded by whitespace.
When the tcsh shell’s input is not a terminal, the character ’#’ is taken to begin a
comment. Each # and the rest of the input line on which it appears is discarded
before further parsing.
A special character (including a blank or tab) may be prevented from having its
special meaning, and possibly made part of another word, by preceding it with a
backslash (\) or enclosing it in single ( ’ ), double ( ″ ) or backward (’ ` ’) quotes.
When not otherwise quoted a newline preceded by a \ is equivalent to a blank, but
inside quotes this sequence results in a newline.
Furthermore, all substitutions (see “Substitutions” on page 637) except history
substitution can be prevented by enclosing the strings (or parts of strings) in which
they appear with single quotes or by quoting the crucial characters (e.g. ’$’ or ’ `’ for
variable substitution or command substitution respectively) with \. (alias substitution
is no exception: quoting in any way any character of a word for which an alias has
been defined prevents substitution of the alias. The usual way of quoting an alias is
to precede it with a backslash.) History substitution is prevented by backslashes but
not by single quotes. Strings quoted with double or backward quotes undergo
Variable substitution and Command substitution, but other substitutions are
prevented.
Text inside single or double quotes becomes a single word (or part of one).
Metacharacters in these strings, including blanks and tabs, do not form separate
words. Only in one special case (see “Command substitution” on page 643) can a
double-quoted string yield parts of more than one word; single-quoted strings never
do. Backward quotes are special: they signal command substitution, which may
result in more than one word.
Quoting complex strings, particularly strings which themselves contain quoting
characters, can be confusing. Remember that quotes need not be used as they are
636 z/OS V1R9.0 UNIX System Services Command Reference