Built‐in Commands

dpshell provides 50+ built-in commands organized by category.

Navigation & Directories

Command	Description
cd	Change directory (supports cd ? and cd ?? interactive modes)
pwd	Print working directory
pushd	Push directory onto stack
popd	Pop directory from stack
dirs	Display directory stack

Variables & Environment

Command	Description
export	Set environment variables
unset	Remove variables
readonly	Mark variables as read-only
local	Declare function-local variables
declare / typeset	Declare variables with attributes
let	Evaluate arithmetic expressions
set	Set/unset shell options and positional parameters

I/O & Text

Command	Description
echo	Print arguments to stdout
printf	Formatted output
read	Read input with multi-variable word splitting
mapfile / readarray	Read lines into an array variable

Flow Control

Command	Description
break	Exit from a loop
continue	Skip to next loop iteration
return	Return from a function
shift	Shift positional parameters
exit / logout	Exit the shell
trap	Set signal handlers
wait	Wait for background processes

Job Control

Command	Description
jobs	List background/stopped jobs
fg	Bring job to foreground
bg	Resume job in background
kill	Send signals to processes
suspend	Suspend the shell

Shell Management

Command	Description
alias / unalias	Define/remove command aliases
history	Display command history
source / .	Execute commands from a file in the current shell
eval	Evaluate a string as a command
exec	Replace shell with command
command	Run command bypassing functions
builtin	Run a builtin bypassing functions
type	Show how a command name would be interpreted
help	Display help for builtins
hash	Manage the command hash table
enable	Enable/disable builtins

Test & Logic

Command	Description
test / [	Evaluate conditional expressions
true	Return success (exit 0)
false	Return failure (exit 1)

Configuration & System

Command	Description
shopt	Set/unset shell options
ulimit	Get/set resource limits
umask	Set file creation mask
times	Print accumulated user and system times
caller	Return the context of the current subroutine call
fc	Fix command — list/edit/re-execute history entries
getopts	Parse positional parameters
complete / compgen / compopt	Programmable completion control
bind	Display/modify key bindings

Special

Command	Description
:	No-op (always returns 0)