"... most people use the which command and have never even heard of the type command! ..."

That's very interesting. I've used quite an array of shells since the '80s (sh, ksh, bash, csh, tcsh, and others). I'm reasonably certain I've used which almost exclusively. I couldn't definitely say I've never heard of type but, had I been asked about it yesterday, I would have had to look it up. I decided to look into this a bit further.

There appears to be some redundant information (<some-command> is) with type; however, in isolation that doesn't appear to be a problem.

$ which perl
/.../perl

$ type perl
perl is /.../perl
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I did encounter an issue in this scenario:

$ 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
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On the other hand, it's particularly useful here:

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

$ type perle
perle is aliased to `perl -Mstrict -Mwarnings -Mautodie=:all -MCarp::A
+lways -E'
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So, it looks like both commands have their uses in different situations. I will remember type from now on and use it where needed. Thanks for pointing out this command. [Edit: Actually, it looks like LanX was the first to mention type, so thanks Rolf.]

I've been an SA for like 10 years and never knew that until now. When I think type, I think DOS / windows cat command. Seems to still work in powershell:

PS C:\Users\Dubs> get-Command type,cat,where,gm,help,get-help

CommandType     Name                       Version    Source
-----------     ----                       -------    ------
Alias           type -> Get-Content
Alias           cat -> Get-Content
Alias           where -> Where-Object
Alias           gm -> Get-Member
Function        help
Cmdlet          Get-Help                  3.0.0.0    Microsoft.PowerSh
+ell.Core
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Looks like zsh and csh alias to whence -v.