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.. -*- coding: utf-8; -*-
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=======
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Bash.
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=======
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How override PS1, PS2?
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======================
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When loading bash read ~/.bash_profile and ~/.bashrc.
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Put at end of these files::
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PS1='\u@\H$ '
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When xterm start bash - it start as non-login. So ~/.bash_profile and ~/.bashrc
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didn't read. To workaround this use::
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$ xterm -e bash -i -c "mc -x"
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That make bash interactive and init file was readed.
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Command history.
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================
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Bash allow accessing to command that you type previously. There are several
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options to control command history behavior. Set corresponding variables in
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your ~/.bashrc file (which is read by interactive shell)::
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# ignorespace do not save lines that start with space
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# erasedups all previous lines matching the current line to be removed from
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# the history list before that line is saved
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export HISTCONTROL=igrorespace:erasedups
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export HISTIGNORE=" ?cd *":"e *":"sudo mv *":"sudo rm *":"sudo cp *":"sudo mkdir *":"sudo chmod *":"sudo chown *":ls:pwd:"vlc*"
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There are another options, with default values (which satisfy my needs, so
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I don't put they to ~/.bashrc)::
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export HISTFILE=~/.bash_history # where is command history stored
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export HISTFILESIZE=500 # how many lines been in $HISTFILE
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export HISTSIZE=500 # how many lines been stored in bash process
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mc (GNU Midnight Commander).
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----------------------------
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You can also set special history rules for mc subshell in ~/.mc/bashrc file.
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Bash history.
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=============
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http://wiki.bash-hackers.org/scripting/bashchanges
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This article is an incomplete overview of changes to Bash over
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the time.
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