SunOS man pages : shell_builtins (1)
User Commands shell_builtins(1)
NAME
shell_builtins - shell command interpreter built-in func-
tions
DESCRIPTION
The shell command interpreters sh(1), csh(1), and ksh(1)
have special built-in functions which are interpreted by the
shell as commands. Many of these built-in commands are
implemented by more than one of the shells, and some are
unique to a particular shell. These are:
command built into
alias csh, ksh
bg csh, ksh, sh
break csh, ksh, sh
case csh, ksh, sh
cd csh, ksh, sh
chdir csh, sh
continue csh, ksh, sh
dirs csh
echo csh, ksh, sh
eval csh, ksh, sh
exec csh, ksh, sh
exit csh, ksh, sh
export ksh, sh
fc ksh
fg csh, ksh, sh
for ksh, sh
foreach csh
function ksh
getopts ksh, sh
glob csh
goto csh
hash ksh, sh
hashstat csh
history csh
if csh, ksh, sh
jobs csh, ksh, sh
kill csh, ksh, sh
let ksh
limit csh
login csh, ksh, sh
logout csh, ksh, sh
nice csh
newgrp ksh, sh
notify csh
onintr csh
popd csh
print ksh
pushd csh
pwd ksh, sh
SunOS 5.8 Last change: 1 Feb 1995 1
User Commands shell_builtins(1)
read ksh, sh
readonly ksh, sh
rehash csh
repeat csh
return ksh, sh
select ksh
set csh, ksh, sh
setenv csh
shift csh, ksh, sh
source csh
stop csh, ksh, sh
suspend | csh, ksh, sh
switch | csh
test | ksh, sh
time | csh
times | ksh, sh
trap | ksh, sh
type | ksh, sh
typeset | ksh
ulimit | ksh, sh
umask | csh, ksh, sh
unalias | csh, ksh
unhash | csh
unlimit | csh
unset | csh, ksh, sh
unsetenv | csh
until | ksh, sh
wait | csh, ksh, sh
whence | ksh
while | sh, ksh, sh
Bourne Shell, sh, Special Commands
Input/output redirection is now permitted for these com-
mands. File descriptor 1 is the default output location.
When Job Control is enabled, additional Special Commands are
added to the shell's environment.
Additional to these built-in reserved command words, sh also
uses:
: No effect; the command does nothing. A zero exit code
is returned.
.filename
Read and execute commands from filename and return.
The search path specified by PATH is used to find the
directory containing filename.
C shell, csh
Built-in commands are executed within the C shell. If a
built-in command occurs as any component of a pipeline
SunOS 5.8 Last change: 1 Feb 1995 2
User Commands shell_builtins(1)
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 per-
forms no action.
Korn Shell, ksh, Special Commands
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:
1. Variable assignment lists preceding the command remain in
effect when the command completes.
2. I/O redirections are processed after variable assign-
ments.
3. Errors cause a script that contains them to abort.
4. 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.
* .file [ arg ... ]
Read the complete file then execute the commands. The
commands are executed in the current shell environ-
ment. 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.
SEE ALSO
intro(1), alias(1), break(1), case(1), cd(1), chmod(1),
csh(1), echo(1), exec(1), exit(1), find(1), for(1), function(1)
, getoptcvt(1), getopts(1), glob(1), hash(1), history(1)
, if(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),
SunOS 5.8 Last change: 1 Feb 1995 3
User Commands shell_builtins(1)
typeset(1), umask(1), wait(1), while(1), chdir(2), chmod(2),
creat(2), umask(2), getopt(3C), profile(4), environ(5)
SunOS 5.8 Last change: 1 Feb 1995 4
|
 |
|
|
