$ which perl
/.../perl

$ type perl
perl is /.../perl

##</code><code>##

$ ls -l `which perl`
-rwxr-xr-x 2 ken None 169225 Jun 23 20:35 /.../perl

$ ls -l `type perl`
ls: cannot access 'perl': No such file or directory
ls: cannot access 'is': No such file or directory
-rwxr-xr-x 2 ken None 169225 Jun 23 20:35 /.../perl

##</code><code>##

$ which perle
which: no perle in (...)

$ type perle
perle is aliased to `perl -Mstrict -Mwarnings -Mautodie=:all -MCarp::Always -E'