The Bash Built-in Commands

Bash Linux Commands Techhyme

This article provides a concise guide to allow you to quickly look up a feature or command that you can use from the bash command line or from a bash shell script.

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Built-in Commands the bash shell includes many popular commands built into the shell. This provides for faster processing times when using these commands.

Command Description
alias Define an alias for the specified command.
bg Resume a job in background mode.
bind Bind a keyboard sequence to a redline function or macro.
break Exit from a for, while, select, or until loop.
builtin Execute the specified shell built-in command.
cd Change the current directory to the specified directory.
caller Return the context of any active subroutine call.
command Execute the specified command without the normal shell lookup.
compgen Generate possible completion matches for the specified word.
complete Display how the specified words would be completed.
continue Resume the next iteration of a for, while, select, or until loop.
declare Declare a variable or variable type.
dirs Display a list of currently remembered directories.
disown Remove the specified jobs from the jobs table for the process.
echo Display the specified string to STDOUT.
enable Enable or disable the specified built-in shell command.
eval Concatenate the specified arguments into a single command, and then execute the Command.
exec Replace the shell process with the specified command.
exit Force the shell to exit with the specified exit status.
export Set the specified variables to be available for child shell processes.
fc Select a list of commands from the history list.
fg Resume a job in foreground mode.
getopts Parse the specified positional parameters.
hash Find and remember the full pathname of the specified command.
help Display a help file.
history Display the command history.
jobs List the active jobs.
kill Send a system signal to the specified process ID (PID).
let Evaluate each argument in a mathematical expression.
local Create a limited-scope variable in a function.
logout Exit a login shell.
popd Remove entries from the directory stack.
printf Display text using formatted strings.
pushd Add a directory to the directory stack.
pwd Display the pathname of the current working directory.
read Read one line of data from STDIN and assign it to a variable.
readonly Read one line of data from STDIN and assign it to a variable that can’t be changed.
return Force a function to exit with a value that can be retrieved by the calling script.
set Set and display environment variable values and shell attributes.
shift Rotate positional parameters down one position.
shopt Toggle the values of variables controlling optional shell behavior.
suspend Suspend the execution of the shell until a SIGCONT signal is received.
test Return an exit status of O or 1 based on the specified condition.
times Display the accumulated user and system
trap Execute the specified command if the specified system signal is received.
type Display how the specified word would be interpreted if used as a command.
ulimit Set a limit on the specified resource for system users.
umask Set default permissions for newly created files and directories.
unalias Remove the specified alias.
unset Remove the specified environment variable or shell attribute.
wait Wait for the specified process to complete, and return the exit status.


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