When xterm start bash - it start as non-login. So ~/.bash_profile and ~/.bashrc

That make bash interactive and init file read.

* Command history.

Bash allow accessing to command that you type previously. There are exist

several options to control command history behavior. Set corresponding

variables in your ~/.bashrc file (which is read by interactive shell):

  #   ignorespace do not save lines that start with space

  #   erasedups all previous lines matching the current line to be removed from

  #             the history list before that line is saved

  export HISTCONTROL=igrorespace:erasedups

  export HISTIGNORE=" ?cd *":"e *":"sudo mv *":"sudo rm *":"sudo cp *":"sudo mkdir *":"sudo chmod *":"sudo chown *":ls:pwd:"vlc*"

There are another options, with default values (which satisfy my neediness, so

I don't put they to ~/.bashrc):

  export HISTFILE=~/.bash_history  # where is command history stored

  export HISTFILESIZE=500          # how many lines been in $HISTFILE

  export HISTSIZE=500              # how many lines been stored in bash process

** mc (GNU Midnight Commander).

You can also set special history rules for mc subshell in ~/.mc/bashrc file.