! is pretty cool when used with history. If you enter history, you could use the reference number for any command from the list, and reuse it by doing: !123, where 123 is the number. Also, you could pipehistory (e.g, history | grep sudo to find all commands in history with sudo).
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!is pretty cool when used withhistory. If you enterhistory, you could use the reference number for any command from the list, and reuse it by doing:!123, where123is the number. Also, you couldpipehistory(e.g,history | grep sudoto find all commands inhistorywithsudo).