Commands history and recalling

Command: $ history

File: ~/.bash_history

Syntax:

• !
  Start a history substitution
• !$
  Refer to the last argument in a line
• !n
  Refer to the nth command line
• !string
  Refer to the most recent command starting with string

Variables:

• HISTFILE
  The location of the history file
• HISTFILESIZE
  The maximum number of lines in the history file (default 500)
• HISTSIZE
  The maximum number of commands in the history file
• HISTCONTROL
  How commands are stored
• HISTIGNORE
  Which command lines can be unsaved

Shortcuts:

• CTRL+R
  Searches a previous command
• !!
  Executes the last command

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