Inspect command resolution
Show whether a name resolves to an alias, builtin, function, or executable.
bashANYtypebuiltins
bash
type -a lsNotes
Great 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.
Export
Copy the compact sheet, download it, or print it.
Download
`D` dense toggle · `C` copy all
Core Builtins
Frequently used builtins and shell introspection commands.
bash
command -v bashNotes
Portable pattern for existence checks in scripts.
bash
help readNotes
Useful for quick lookup without leaving the terminal.
bash
alias ll='ls -lah'Notes
Aliases are best for interactive shells, not scripts.
bash
aliasNotes
Good for debugging startup files.
bash
unalias llNotes
Use unalias -a to remove all aliases in current shell.
Disable builtin temporarily
Disable a builtin so external command resolution can win.
bashANYenablebuiltins
bash
enable -n testNotes
Advanced tool mostly used for compatibility and testing.
set and shopt
Modify shell behavior and optional features.
bash
set -oNotes
Useful when debugging shell behavior or startup files.
bash
shoptNotes
Bash separates many optional features under shopt.
bash
shopt -s globstar
printf '%s
' **/*.shNotes
Very handy for script discovery and file operations.
bash
shopt -s extglob
printf '%s
' !(*.md)Notes
Useful for richer filename matching.
bash
set -fNotes
Useful when handling user-provided patterns literally.
History and Interactive Features
Use history builtins and interactive helpers.
bash
history | tailNotes
Interactive Bash maintains a history list and file.
bash
fc -s old=newNotes
Handy for quick corrections in interactive shells.
bash
bind -P | headNotes
Useful when customizing terminal shortcuts.
bash
source ~/.bashrcNotes
Often used after editing aliases, exports, or functions.
Job Control
Background jobs, foreground jobs, and waits.
bash
sleep 60 &Notes
The shell prints a job number and PID in interactive mode.
bash
jobs -lNotes
Interactive Bash tracks stopped and background jobs.
bash
fg %1Notes
Use jobs to inspect job numbers first.
bash
bg %1Notes
Common after Ctrl+Z.
bash
pid=$!
wait "$pid"Notes
Capture $! right after starting a job.
bash
disown %1Notes
Useful when you want a job to survive shell exit semantics.
bash
kill -TERM %1Notes
Job specs are very handy in interactive Bash.
Signals and Traps
Handle signals and cleanup behavior.
bash
trap 'echo interrupted' INTNotes
Useful for cleanup and user-friendly interruption.
bash
trap 'status=$?; echo "exiting with $status"' EXITNotes
Helpful in wrappers and CI scripts.
bash
trap -pNotes
Useful 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.
Recommended next
Terraform Troubleshooting and Migration Cheat Sheet
TERRAFORM
Commands and patterns for debugging, upgrades, migration, and state repair in Terraform.
Terraform HCP Remote and CI Cheat Sheet
TERRAFORM
Commands and snippets for HCP Terraform remote runs, CLI auth, automation, and CI-friendly usage.
Terraform Language Patterns Cheat Sheet
TERRAFORM
High-value HCL patterns for variables, locals, outputs, loops, conditionals, dynamic blocks, and data shaping.
Terraform Modules and Providers Cheat Sheet
TERRAFORM
Commands and snippets for modules, providers, version constraints, registry access, and dependency management.
Terraform Workspaces and State Cheat Sheet
TERRAFORM
Manage Terraform CLI workspaces, local and remote state, imports, and state surgery commands.
Terraform CLI Cheat Sheet
TERRAFORM
Core Terraform CLI commands for init, plan, apply, state, output, variables, workspaces, and automation.