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Re: How much of it is zsh?
- X-seq: zsh-users 14968
- From: Stephane Chazelas <stephane_chazelas@xxxxxxxx>
- To: Nadav Har'El <nyh@xxxxxxxxxxxxxxxxxxx>
- Subject: Re: How much of it is zsh?
- Date: Wed, 24 Mar 2010 19:49:31 +0000
- Cc: zzapper <david@xxxxxxxxxx>, zsh-users@xxxxxxx
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2010-03-24 14:03:59 +0200, Nadav Har'El:
> You're right that the two commands
> egrep -R something dir
> egrep something dir/**/*
> basically end up doing the same thing, but I don't see why you should
> consider this a problem. By the way, if you're curious, there's actually
> a subtle difference between the way these two work. Like I said, the shell's
> globbing is always done in advance. So if dir has a million files under it,
> this will expand into a command with a million arguments - which on some
> system can be a problem (too much memory used, or command too long).
> On the other hand, egrep -R finds the files recursively one by one, and
> never needs to hold the whole list of files in memory.
There are a few other differences:
- grep -R (at least the GNU variant as probably found on
cygwin) will follow symbolic links when descending directories
(use dir/***/* to achieve the same with zsh).
- **/* will ommit dot files and do dirs, use **/*(D) to avoid
- **/* also sorts the list of files which adds some more overhead but
produces a more reproducible outcome. Use **/*(oN) to prevent
egrep -R something dir
would be more like:
egrep something dir/***/*(DoN)
grep -E something dir/**/*(.DoN)
would probably be more what you'd want though.
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