4.3.11 Command alias
You can set an alias for the frequently used command. For example:
$ alias la='ls -la'
Now, la works as a short hand for ls -la which lists
all files in the long listing format.
You can identity exact path or identity of the command using type
command. For example:
$ type ls
ls is hashed (/bin/ls)
$ type la
la is aliased to `ls -la'
$ type echo
echo is a shell builtin
$ type file
file is /usr/bin/file
Here ls was recently searched while file was not,
thus ls is "hashed", i.e., the shell has an internal
record for the quick access to the location of the ls command.
