Tips.Bash.md

Bash Tips

References

• https://www.gnu.org/software/bash/

• https://tiswww.case.edu/php/chet/bash/bashtop.html

• https://www.gnu.org/software/bash/manual/

  • https://www.gnu.org/software/bash/manual/html_node/index.html
  • https://www.gnu.org/software/bash/manual/bash.html
  • https://www.gnu.org/software/bash/manual/bash.pdf

• https://man7.org/linux/man-pages/man1/bash.1.html

• https://tldp.org/LDP/Bash-Beginners-Guide/html/Bash-Beginners-Guide.html

  • Last updated, 2008-12-27 ?

Files

• .bash_profile

  • The personal initialization file, executed for login shells
  • runs once when you log in (login shell)
  • Settings defined in .bash_profile (like environment variables) are generally inherited by all subsequent shells and processes started within that login session.
  • Ensure that your ~/.bash_profile (or ~/.profile, if ~/.bash_profile doesn't exist) explicitly sources your ~/.bashrc using a command like if [ -f ~/.bashrc ]; then source ~/.bashrc; fi

• .bashrc

  • The individual per-interactive-shell startup file
  • runs every time you open a new interactive shell (non-login shell)
  • Put most of your configuration (aliases, functions, prompt customization, and environment variables) in your ~/.bashrc file.

• .bash_logout

  • The individual login shell cleanup file, executed when a login shell exits

• .profile

  • has the stuff NOT specifically related to bash, such as environment variables (PATH and friends)
  • must be compatible with any /bin/sh – this includes bash, dash, ksh, whatever else a distro might choose to use. (?)

Community Resources

• https://unix.stackexchange.com/questions/tagged/bash

Commands

• Show Command Help

  • help
  • bash -c help

• shopt

  • https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html

  • show/change the settings of shell options

  • shopt -p - print each shell option with an indicator of whether it is set or not.