To reuse a command, use Ctrl + R and type a few matching keywords. Use 'history' cmd to list previous cmds and '!<number>' to reuse. View date/time in history using HISTTIMEFORMAT.
Chain multiple cmds: ; (sequentially), && (next cmd if previous fails), || (run only if prev fails). 'less' displays file content in chunks for easy navigation.
Utilize column cmd for text output in readable format, -t for tabular view, -s for delimiters. Truncate files to remove content efficiently.
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