Fedora Linux

   PROMPT_COMMAND='echo -ne '33_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}'; echo -ne '33\''
  fi
 ;;
 *)
  [ -e /etc/sysconfig/bash-prompt-default ] && PROMPT_COMMAND=/etc/sysconfig/bash-prompt-default
 ;;
 esac
# Turn on checkwinsize
 shopt -s checkwinsize
 [ '$PS1' = '\s-\v\$ ' ] && PS1='[u@h W]\$ '
fi
if ! shopt -q login_shell ; then # We're not a login shell
 # Need to redefine pathmunge, it get's undefined at the end of /etc/profile
 pathmunge ( ) {
  if ! echo $PATH | /bin/egrep -q '(^|:)$1($|:)' ; then
   if [ '$2' = 'after' ] ; then
    PATH=$PATH:$1
   else
    PATH=$1:$PATH
   fi
  fi
 }
 for i in /etc/profile.d/*.sh; do
  if [ -r '$i' ]; then
   . $i
  fi
 done
 unset i
 unset pathmunge
fi
# vim:ts=4:sw=4

This script sets up the umask , configures a command that will be executed before the display of each prompt (which sets the terminal-window title to show the user, host, and current directory), and then executes each of the files in /etc/profile.d that end in .sh .

Packages installed on your Fedora system can include files that are placed in /etc/profile.d , providing a simple way for each package to globally add aliases or other shell configuration options. There are a few command aliases defined in these script files, including:

alias l.='ls -d .* --color=tty'
alias ll='ls -l --color=tty'
alias ls='ls --color=tty'
alias vi='vim'

If you type ll at a command prompt, ls -l will be executed, due to the alias highlighted in the preceding listing:

$ ll /
total 138
drwxr-xr-x 2 root root 4096 Jul 17 08:08 bin
drwxr-xr-x 4 root root 1024 Jul 15 11:16 boot
drwxr-xr-x 12 root root 3900 Jul 19 07:56 dev
drwxr-xr-x 102 root root 12288 Jul 18 18:14 etc
drwxr-xr-x 8 root root 4096 Jul 16 22:51 home
drwxr-xr-x 11 root root 4096 Jul 17 07:58 lib
drwx------ 2 root root 16384 Jun 9 19:34 lost+found
drwxr-xr-x 4 root root 4096 Jul 18 18:14 media
drwxr-xr-x 2 root root 0 Jul 18 11:48 misc
drwxr-xr-x 6 root root 4096 Jul 15 11:38 mnt
drwxr-xr-x 2 root root 0 Jul 18 11:48 net
drwxr-xr-x 2 root root 4096 Jul 12 04:48 opt
dr-xr-xr-x 126 root root 0 Jul 18 11:46 proc
drwxr-x--- 9 root root 4096 Jul 18 00:18 root
drwxr-xr-x 2 root root 12288 Jul 17 08:08 sbin
drwxr-xr-x 4 root root 0 Jul 18 11:46 selinux
drwxr-xr-x 2 root root 4096 Jul 12 04:48 srv
drwxr-xr-x 11 root root 0 Jul 18 11:46 sys
drwxrwxrwt 98 root root 4096 Jul 19 11:04 tmp
drwxr-xr-x 14 root root 4096 Jul 14 04:17 usr
drwxr-xr-x 26 root root 4096 Jul 14 04:17 var

Similarly, if you type vi the shell will execute vim .

You can create your own aliases using the alias command; for example, I like to use l for ls -l , sometimes use cls to clear the screen, and like to have machine report the hostname (old habits):

$ alias l='ls -l
$ alias cls='clear'
$ alias machine='hostname'

Adding the same lines to ~/.bashrc will make them available every time you start a new shell; adding them to ~/.bashrc will make them available to all users.

You can see the currently defined aliases by typing alias alone as a command:

$ alias
alias cls='clear'
alias l='ll'
alias l.='ls -d .* --color=tty'
alias ll='ls -l --color=tty'
alias ls='ls --color=tty'
alias machine='hostname'
alias vi='vim'

To destroy an alias, use the unalias command:

$ unalias machine
$ alias
alias cls='clear'
alias l='ll'