Shell Scripting

Check for Existence of Binary

function require_curl() { which "curl" &>/dev/null; }

Simple Debug Messages

function debug() { ((DEBUG)) && echo ">>> $*"; }
...
debug "Starting database import."

Using Default Value if None Provided

URL=${URL:-http://localhost:8080}

Tips

Use hashtags for commands to easily find them again in your history.

How-Tos

Run Command Line Editor

<ESC> e

Place Argument of Last Command

<ESC> .

Repairing a Broken Terminal

reset

Expand Path to Command

ls -l =curl

Paste Todays Date (grml Config)

<C-e>d

Batch Rename File Extension

zmv -Q '(**/)(*).txt' '$1$2.md'