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Size: 2872
Comment: Reorg
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← Revision 4 as of 2025-12-19 20:19:12 ⇥
Size: 3180
Comment: Cleanup
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| Deletions are marked like this. | Additions are marked like this. |
| Line 14: | Line 14: |
| ||`.` || || || | ||`.` || || || |
| Line 21: | Line 21: |
| ||`dirs` || || || ||`disown` || || || ||`echo` || || || ||`enable` || || || |
||`dirs` || || || ||`disown` || || || ||`echo` || || || ||`enable` || || || |
| Line 29: | Line 29: |
| ||`fc` || || || ||`getopts` || || || ||`hash` || || || |
||`fc` || || || ||`getopts` || || || ||`hash` || || || |
| Line 33: | Line 33: |
| ||`history` || || || ||`kill` || || || |
||`history` || || || ||`kill` || || || |
| Line 36: | Line 36: |
| ||`mapfile` || || || ||`popd` || || || ||`printf` || || || ||`pushd` || || || |
||`mapfile` || || || ||`popd` || || || ||`printf` || || || ||`pushd` || || || |
| Line 41: | Line 41: |
| ||`read` || || || ||`readarray` || || || ||`readonly` || || || |
||`read` || || || ||`readarray` || || || ||`readonly` || || || |
| Line 47: | Line 47: |
| ||`time` || || || ||`trap` ||Creates a [[Shell/Trap|here]]|| || ||`typeset` || || || |
||`time` || || || ||`trap` ||Creates a trap || || ||`typeset` || || || |
| Line 52: | Line 52: |
| ||`wait` || || || | ||`wait` || || || |
Shell Builtin Commands
The set of portable commands.
Commands
Command |
Description |
Example |
. |
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: |
No-op |
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alias |
Creates an alias |
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bind |
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builtin |
Executes a builtin command |
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cd |
Changes the current working directory |
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command |
Executes a command |
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dirs |
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disown |
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echo |
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enable |
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eval |
Executes a command |
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exec |
Replaces the shell with a command |
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exit |
Causes a script or shell to exit immediately |
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export |
Marks one or more names as variables to be included in the environment of subsequently-called commands |
export varname="some value" |
fc |
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getopts |
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hash |
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help |
Prints helpful information about a builtin command |
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history |
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kill |
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logout |
Exits a login shell immediately |
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mapfile |
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popd |
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printf |
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pushd |
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pwd |
Prints the current working directory |
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read |
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readarray |
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readonly |
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set |
Sets a shell option |
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shift |
Renames the positional variables |
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test |
Executes a test |
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time |
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trap |
Creates a trap |
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typeset |
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unalias |
Removes an alias |
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unset |
Unsets a shell option |
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wait |
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Builtin
builtin can be useful to call a builtin command when there is a custom command with the same name.
Cd
Calling cd without an argument is the same as cd ~.
cd - changes the current working directory to the previous working directory.
Command
command can be useful to call a command when there is a function with the same name.
command is also commonly used to determine if a command is locally available.
if ! command -v mypy >/dev/null 2>&1; then echo "cannot locate mypy; is it installed?" exit fi
Reserved Keywords
Some parts of the language are technically implemented as a command.
See here for break and continue.
See here for return.
See here for bg, fg, and jobs.