Type
! followed by the beginning of a command you've already used...and hit enter. it will auto exec that command in full...you ran last. obvoiusly be careful with somethings.
i also presume everyone knows ~userid prefers to userid's home directory.
also if on the command line and have vi editor mode activated ( bash -o vi ( works with ksh too ) ) then go for a ESC V and that will bring the command line straight into a full vi session
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