The shell reads and executes a single line of input. (u)Ĭommand input is taken from the standard input. The shell accepts SIGQUIT (see Signal handling) and behaves when it is used under a debugger. The shell parses commands but does not execute them. Newer versions of su(1) can pass -m to the shell. The shell loads ~/.tcshrc even if it does not belong to the effective user. Applicable only if -l is the only flag specified.
Shells are interactive without this option if their
The shell is interactive and prompts for its top-level input, even if it appears to not be a terminal. The shell uses fork(2) instead of vfork(2) to spawn processes. The shell does not load any resource or startup files, or perform any command hashing, and thus starts faster. The shell exits if any invoked command terminates abnormally or yields a non-zero exit status.
Sets the environment variable name to value. The shell loads the directory stack from ~/.cshdirs as described under Startup and shutdown, whether or not it is a login shell. Any remaining arguments are placed in the argv shell variable. The shell will not run a set-user IDĬommands are read from the following argument (which must be present, and must be a single argument), stored in the command shell variable for This may be used to pass options to a shell script without confusion or possible subterfuge. The rest of the flag arguments are interpreted as follows:įorces a ''break'' from option processing, causing any further shell arguments to be treated as non-option arguments. A login shell can be also specified by invoking the shell with the Which are present in csh(1) but not usually documented are labeled with '(u)'.Īrgument list processing If the first argument (argument 0) to the shell is '-' then it is a login shell. This manual, features of tcsh not found in most csh(1) implementations (specifically, the 4.4BSD csh) are labeled with '(+)', and features The NEW FEATURES section describes major enhancements of tcsh over csh(1). Job control (see Jobs) and a C-like syntax. It includes a command-line editor (see The command-line editor), programmable wordĬompletion (see Completion and listing), spelling correction (see Spelling correction), a history mechanism (see History substitution), It is a command language interpreter usable bothĪs an interactive login shell and a shell script command processor. Tcsh is an enhanced but completely compatible version of the Berkeley UNIX C shell, csh(1).
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