| Appendix L. History CommandsThe Bash shell provides command-line tools for editing and manipulating a user's command history. This is primarily a convenience, a means of saving keystrokes. Bash history commands: history fc bash$ history 1 mount /mnt/cdrom 2 cd /mnt/cdrom 3 ls ... | Internal variables associated with Bash history commands: $HISTCMD $HISTCONTROL $HISTIGNORE $HISTFILE $HISTFILESIZE $HISTSIZE $HISTTIMEFORMAT (Bash, ver. 3.0 or later) !! !$ !# !N !-N !STRING !?STRING? ^STRING^string^ Unfortunately, the Bash history tools find no use in scripting. #!/bin/bash# history.sh# A (vain) attempt to use the 'history' command in a script.history # No output.var=$(history); echo "$var" # $var is empty.# History commands disabled within a script. | bash$ ./history.sh(no output) | The Advancing in the Bash Shell site gives a good introduction to the use of history commands in Bash. |
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