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

Options
A login shell begins by executing commands from the system files /etc/csh.cshrc
and /etc/csh.login.It then executes commands from files in the user’s home
directory: first ~/.tcshrc, then ~/.history (or the value of the histfile shell variable),
then ~/.login, and finally ~/.cshdirs (or the value of the dirsfile shell variable). The
shell reads /etc/csh.login after /etc/csh.cshrc.
Non-login shells read only /etc/csh.cshrc and ~/.tcshrc or ~/.cshrc on invocation.
Commands like stty, which need be run only once per login, usually go in the
user’s ~/.login file.
In the normal case, the shell begins reading commands from the terminal,
prompting with >. The shell repeatedly reads a line of command input, breaks it into
words, places it on the command history list, and then parses and executes each
command in the line. See “Command execution” on page 645.
A user can log out of a tcsh shell session by typing ^D, logout, or login on an
empty line (see ignoreeof shell variable), or via the shell’s autologout mechanism.
When a login shell terminates, it sets the logout shell variable to normal or
automatic as appropriate, then executes commands from the files /etc/csh.logout
and ~/.logout.
Note: The names of the system login and logout files vary from system to system
for compatibility with different csh variants; see “tcsh files” on page 671.
If the first argument (argument 0) to the tcsh shell is - (hyphen), then it is a login
shell. You can also specify the login shell by invoking the tcsh shell with the –l as
the only argument.
The z/OS UNIX System Services tcsh shell accepts the following options on the
command line:
–b Forces a break from option processing, causing any further shell arguments
to be treated as non-option arguments. The remaining arguments will not be
interpreted as shell options. This may be used to pass options to a shell
script without confusion or possible subterfuge.
–c Reads and executes commands stored in the command shell (this option
must be present and must be a single arugment). Any remaining arguments
are placed in the argv shell variable.
–d Loads the directory stack from ~/.cshdirs as described under “Options and
invocation” on page 626, whether or not it is a login shell.
–e Terminates shell if any invoked command terminates abnormally or yields a
non-zero exit status.
–i Invokes an interactive shell and prompts for its top-level input, even if it
appears to not be a terminal. Shells are interactive without this option if
their inputs and outputs are terminals.
–l Invokes a login shell. Only applicable if –l is the only option specified.
Note: –l is a lower-case L not an upper-case i.
–m Loads ~/.tcshrc even if it does not belong to the effective user.
tcsh
Chapter 2. Shell command descriptions 627