Command-Line Recall
After you type a command line, that entire command line is saved in your shell's history list. The list is stored in a history file, from which any command can be recalled to run again.
[docadmin@mail ~]$ history 20
526 exit
527 su -
528 cd /etc
529 more inittab
530 exit
531 su
532 lspcis
533 lspci
534 su
535 su -
536 su
537 su -
538 su -
539 su -
540 su -
541 id
542 su jepoy
543 history
544 history 10
545 history 20
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