!

R

Logical NOT of a command exit status.

:

Do nothing (just do expansions of any arguments).

.

Read file and execute its contents in current shell.

alias

Set up shorthand for command or command line.

bg

Put job in background.

bind

Bind a key sequence to a readline function or macro.

break

Exit from surrounding for, select, while, or until loop.

builtin

Execute the specified shell built-in.

case

R

Reserved word. Multi-way conditional construct.

cd

Change working directory.

command

Run a command bypassing shell function lookup.

compgen

Generate possible completion matches.

complete

Specify how completion should be performed.

continue

Skip to next iteration of for, select, while, or until loop.

declare

Declare variables and give them attributes. Same as typeset.

dirs

Display the list of currently remembered directories.

disown

Remove a job from the job table.

do

R

Part of a for, select, while, or until looping construct.

done

R

Part of a for, select, while, or until looping construct.

echo

Output arguments.

elif

R

Part of an if construct.

else

R

Part of an if construct.

enable

Enable and disable built-in shell commands.

esac

R

End of a case construct.

eval

Run the given arguments through command-line processing.

exec

Replace the shell with the given program.

exit

Exit from the shell.

export

Create environment variables.

fc

Fix command (edit history file).

fg

End background job in foreground.

fi

R

Part of an if construct.

for

R

Looping construct.

function

R

Define a function.

getopts

Process command-line options.

hash

Full pathnames are determined and remembered.

help

Display helpful information on built-in commands.

history

Display command history.

if

R

Conditional construct.

in

R

Part of a case construct.

jobs

List any background jobs.

kill

Send a signal to a process.

let

Arithmetic variable assignment.

local

Create a local variable.

logout

Exit a login shell.

popd

Remove a directory from the directory stack.

pushd

Add a directory to the directory stack.

pwd

Print the working directory.

read

Read a line from standard input.

readonly

Make variables read-only (unassignable).

return

Return from the surrounding function or script.

select

R

Menu-generation construct.

set

Set options.

shift

Shift command-line arguments.

suspend

Suspend execution of a shell.

test

Evaluate a conditional expression.

then

R

Part of an if construct.

time

R

Run command pipeline and print execution times. The format of the output can be controlled with TIMEFORMAT.

times

Print the accumulated user and system times for processes run from the shell.

trap

Set up a signal-catching routine.

type

Identify the source of a command.

typeset

Declare variables and give them attributes. Same as declare.

ulimit

Set/show process resource limits.

umask

Set/show file permission mask.

unalias

Remove alias definitions.

unset

Remove definitions of variables or functions.

until

R

Looping construct.

wait

Wait for background job(s) to finish.

while

R

Looping construct.