Inspect command resolution
Show whether a name resolves to an alias, builtin, function, or executable.
bashANYtypebuiltins
bash
type -a lsGreat for debugging unexpected command behavior.
Bash Builtins, Job Control, and Shell Behavior
Core Bash builtins, shell options, history, aliases, job control, traps, and interactive-shell behavior.
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Core Builtins
Frequently used builtins and shell introspection commands.
bashANYcommandpath
bash
command -v bashPortable pattern for existence checks in scripts.
bashANYhelpbuiltins
bash
help readUseful for quick lookup without leaving the terminal.
bashANYaliasinteractive
bash
alias ll='ls -lah'Aliases are best for interactive shells, not scripts.
bashANYaliasinteractive
bash
aliasGood for debugging startup files.
bashANYaliasinteractive
bash
unalias llUse unalias -a to remove all aliases in current shell.
bashANYenablebuiltins
bash
enable -n testAdvanced tool mostly used for compatibility and testing.
set and shopt
Modify shell behavior and optional features.
bashANYsetoptions
bash
set -oUseful when debugging shell behavior or startup files.
bashANYshoptoptions
bash
shoptBash separates many optional features under shopt.
bashANYshoptglobstar
bash
shopt -s globstar
printf '%s
' **/*.shVery handy for script discovery and file operations.
bashANYshoptextglob
bash
shopt -s extglob
printf '%s
' !(*.md)Useful for richer filename matching.
bashANYsetglob
bash
set -fUseful when handling user-provided patterns literally.
History and Interactive Features
Use history builtins and interactive helpers.
bashANYhistoryinteractive
bash
history | tailInteractive Bash maintains a history list and file.
bashANYhistoryfc
bash
fc -s old=newHandy for quick corrections in interactive shells.
bashANYbindreadline
bash
bind -P | headUseful when customizing terminal shortcuts.
bashANYsourcestartup
bash
source ~/.bashrcOften used after editing aliases, exports, or functions.
Job Control
Background jobs, foreground jobs, and waits.
bashANYjobsbackground
bash
sleep 60 &The shell prints a job number and PID in interactive mode.
bashANYjobsbackground
bash
jobs -lInteractive Bash tracks stopped and background jobs.
bashANYjobsforeground
bash
fg %1Use jobs to inspect job numbers first.
bashANYjobsbackground
bash
bg %1Common after Ctrl+Z.
bashANYwaitbackground
bash
pid=$!
wait "$pid"Capture $! right after starting a job.
bashANYdisownjobs
bash
disown %1Useful when you want a job to survive shell exit semantics.
bashANYkilljobs
bash
kill -TERM %1Job specs are very handy in interactive Bash.
Signals and Traps
Handle signals and cleanup behavior.
bashANYtrapsignals
bash
trap 'echo interrupted' INTUseful for cleanup and user-friendly interruption.
bashANYtrapexit
bash
trap 'status=$?; echo "exiting with $status"' EXITHelpful in wrappers and CI scripts.
bashANYtrapdebug
bash
trap -pUseful during debugging and library-style shell scripts.
More in Bash
Bash Scripting Patterns and Practical Recipes
Production-minded Bash script patterns for files, arguments, parsing, temp files, logging, retries, and common automation tasks.
Bash Arrays, Strings, and Text Handling
Indexed and associative arrays, string handling, read/mapfile, and common Bash text-processing patterns.
Bash Conditionals, Loops, and Functions
Bash if/elif/case logic, test expressions, loops, functions, return codes, and robust control-flow patterns.
Bash Variables, Quoting, and Expansion
Bash variables, parameter expansion, quoting rules, command substitution, arithmetic, and shell expansion patterns.
Bash Cheat Sheet
Comprehensive Bash commands, shell syntax, quoting, variables, redirection, pipelines, and day-to-day scripting patterns.
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