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Some tips to handle history in bash shell.

This page is for sharing a perl script for line length control.

1. This pages describes the way I use history in bash. History can save a lot of key typing.
   


2. To start some useful aliases are needed:
   #under bash
   alias h=history
   function hg () { history | grep $1; }
   
   #under csh
   alias hg 'h | grep \!:1'
   The first one is trivial. The second, the hg alias passes a parameter, to display the history commands filtered by grep .
   


3. To farther display history command fetch features, lets do some commands first:
   
   
   mkdir kuku
   cd !$
   date > a.txt
   cp a.txt{,.bak}
   vi a.txt
   gvimdiff a.txt{.bak,}
   ls a.txt{,.bak}
   a.txt a.txt.bak
   
   !cp:p
   Puts the last command from history, which started with cp, as first in history. You can now use up arrow to refer to this command.
   ^R (control R) (reverse-i-search)`':da
   and bash will complete with the last command, from history, starting with da
   
   
   


4. Recently I work on a TCSH, which does not have control R option. The closest I could do, is to use the upper arrows in a similar way to ESP P. So regular arrow just goes forward or backward in history as usual. But If I put prefix, say vi AA then use the arrow it'll bring commands from history, which start with this pattern: vi AA
   
   bindkey -k down history-search-forward
   bindkey -k up history-search-backward
   bindkey "^R" i-search-back
   

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