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Run the last command again:
 !!

Run command 423 in your history buffer (type history to see the list):
 !423

Run the last command that starts with grep:
 !grep

Run the last command but substitute the first occurence of arg1 with arg2:
 ^arg1^arg2

Run the last command but substitute ALL occurences of arg1 with arg2:
 !:gs/arg1/arg2/

Return to Tip 16: Fast command history in bash.

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