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Re: conditional aliases are broken


From: Eric Blake
Subject: Re: conditional aliases are broken
Date: Thu, 18 Aug 2011 11:53:56 -0600
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On 08/18/2011 11:38 AM, Stefano Lattarini wrote:
Hi Eric.

On Thursday 18 August 2011, Eric Blake wrote:
On 08/18/2011 08:44 AM, Eric Blake wrote:
how do I write a function that would print the same as
$ \ls | cat

Useless use of cat.  This can be done with \ls -1.

f(){ for a in "$@"; do echo "$a"; done; }

Actually, echo "$a" is not portable - if you have any file names beginning with - or containing \, then the results can be corrupted.


Or skip the loop altogether:

f(){ printf %s\\n "%@"; }

I think you've made a typo here; it should have been:

  f () { printf %s\\n "$@"; }

Yep, slip of one key when I typed (at least on my keyboard, % and $ are neighbors).


I guess that's what you meant, right?

BTW, is this behaviour truly portable to other shells and/or printf
utilities?  POSIX seems to require it to portable, but you never
know ...

It's portable, but not always fast (some shells lack printf(1) as a builtin, and end up spawning a process). And in the case of arbitrary file names, printf is always better than echo, since it handles \ and leading - correctly.

--
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org



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