Shell - noyage/redhat GitHub Wiki

• the interface between the user and the kernel
• when a user logs in, /usr/bin/login program checks the username and password and then launches whatever shell defined in the user's /etc/passwd entry
• the shell is a Command Line Interpreter (CLI)
  • it interprets the commands the user types in and arranges for them to be carried out
  • the commands a user types in are actually compiled programs (mostly), some are shell built-ins
  • Shell overview

• most users today use the BASH shell which is the default in Red Hat
• Other shells (they may to be installed on your system)
  • Bourne shell (sh, written by Stephen Bourne at Bell Labs)
  • Z-shell (zsh)
  • C-shell (csh)
  • Korn shell (ksh)
  • Bash shell (Bourne Again SHell)