[SOLVED] what is "l" command, it doing similar to ls
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"l" is an alias, not a program on its own like "ls". If you type "alias" and then press enter, you will see a list of the shortcuts that Ubuntu has pre-configured for you If you type "man ls" you can then get a full description of what those options do as well as other options.
You can make your own aliases easily with the "alias" command. It is built into bash, so you will find information about it buried deeply in the manual page for "bash" itself. Type "man bash" to get that.
As a Bash user you can create your own :~$ .bashrc file to contain the alias commands;
Sample .bashrc for my users
~$ cat .bashrc
#08-30-06 12:20 gws copied loki:/root
# Add bin to path
# Dynamic resizing
shopt -s checkwinsize
#save bash history so as to share
shopt -s histappend
# Custom prompt
#08-29-06 11:40 gws
if [ `id -un` = root ]; then
# Add color
eval `dircolors -b`
#Terminus is a very nice Unicode font for the Linux console
#from dugan's site http://duganchen.ca/writings/slackware/fonts/
#04-30-12 11:41 removed
#if [ $TERM = "linux" ]; then
# setfont ter-v16n
# User defined aliases
alias clls='clear; ls'
alias ll='ls -l'
alias listlong='ls -l'
alias lsa='ls -A'
alias lsg='ls | grep'
alias lsp='ls -1 /var/log/packages/ > package-list'
alias web='links -g -download-dir ~/ www.google.com'
#08-29-06 11:50 gws
#To clean up and cover your tracks once you log off
#Depending on your version of BASH, you might have to use
# the other form of this command
trap "rm -f ~$LOGNAME/.bash_history" 0
#The older KSH-style form
# trap 0 rm -f ~$LOGNAME/.bash_history