echo and printf for Outputreadif, else, elif)test, [ ])&&, ||)for Loops and Iterating Over Listswhile and until Loopsbreak and continue$1, $2, etc.)getopts for Command-Line Option Parsingfind and grep for File Searchingawk for Data Extraction and Reportingsed for Stream Editing and Text Substitutionsort, cut, uniq)ps, kill, bg, and fgtrap to Handle Signals and Cleanupcron Jobsat Jobs for One-Time Task Execution$?)trap for Error Handlingset -x and set -ecurl and wget to Download Files from the Internetssh and scp
