No effect; the
command does nothing. A zero exit code is returned.
.Read and execute commands from filename and return. The search path specified
by PATH
is used to find the directory containing filename.
Built-in
commands are executed within the C shell. If a built-in command occurs as
any component of a pipeline except the last, it is executed in a subshell.
Additional to these built-in reserved command words, csh also uses:
- :
- Null
command. This command is interpreted, but performs no action.
Input/Output redirection is permitted. Unless otherwise
indicated, the output is written on file descriptor 1 and the exit status,
when there is no syntax error, is zero.
Commands that are preceded by one
or two * (asterisks) are treated specially in the following ways:
.- Variable
assignment lists preceding the command remain in effect when the command
completes.
.- I/O redirections are processed after variable assignments.
.- Errors
cause a script that contains them to abort.
.- Words, following a command preceded
by ** that are in the format of a variable assignment, are expanded with
the same rules as a variable assignment. This means that tilde substitution
is performed after the = sign and word splitting and file name generation
are not performed.
Additional to these built-in reserved command words,
ksh also uses:
*
- : [ arg ... ]
- The command only expands parameters.
*
....- Read the complete file then execute the commands. The commands are executed
in the current shell environment. The search path specified by PATH
is
used to find the directory containing file. If any arguments arg are given,
they become the positional parameters. Otherwise the positional parameters
are unchanged. The exit status is the exit status of the last command executed.
the loop termination test.
alias(1)
, break(1)
, case(1)
, cd(1)
, chmod(1)
,
csh(1)
, echo(1)
, exec(1)
, exit(1)
, for(1)
, find(1)
, function(1)
, getoptcvt(1)
getopts(1)
, glob(1)
, hash(1)
, history(1)
, if(1)
, intro(1)
, jobs(1)
, kill(1)
,
ksh(1)
, let(1)
, limit(1)
, login(1)
, logout(1)
, newgrp(1)
, nice(1)
, nohup(1)
,
print(1)
, pwd(1)
, read(1)
, readonly(1)
, repeat(1)
, set(1)
, sh(1)
, shift(1)
,
suspend(1)
, test(1B)
, time(1)
, times(1)
, trap(1)
, typeset(1)
, umask(1)
,
wait(1)
, while(1)
, chdir(2)
, chmod(2)
, creat(2)
, umask(2)
, getopt(3C)
,
profile(4)
, environ(5)
Table of Contents
- Name
- Description
- commandbuilt into------------aliascsh, kshbgcsh, ksh, shbreakcsh, ksh, shcasecsh, ksh, shcdcsh, ksh, shchdircsh, shcontinuecsh, ksh, shdirscshechocsh, ksh, shevalcsh, ksh, shexeccsh, ksh, shexitcsh, ksh, shexportksh, shfckshfgcsh, ksh, shforksh, shforeachcshfunctionkshgetoptsksh, shglobcshgotocshhashksh, shhashstatcshhistorycshifcsh, ksh, shjobscsh, ksh, shkillcsh, ksh, shletkshlimitcshlogincsh, ksh, shlogoutcsh, ksh, shnicecshnewgrpksh, shnotifycshonintrcshpopdcshprintkshpushdcshpwdksh, shreadksh, shreadonlyksh, shrehashcshrepeatcshreturnksh, shselectkshsetcsh, ksh, shsetenvcshshiftcsh, ksh, shsourcecshstopcsh, ksh, shsuspendcsh, ksh, shswitchcshtestksh, shtimecshtimesksh, shtrapksh, shtypeksh, shtypesetkshulimitksh, shumaskcsh, ksh, shunaliascsh, kshunhashcshunlimitcshunsetcsh, ksh, shunsetenvcshuntilksh, shwaitcsh, ksh, shwhencekshwhilecsh, ksh, shBourne Shell, sh, Special Commands
- C shell, csh
- Korn Shell, ksh, Special Commands
- See Also