Re: Bash script problem

From	Greg Wooledge <greg@wooledge.org>
Newsgroups	linux.debian.user
Subject	Re: Bash script problem
Date	2021-08-06 02:30 +0200
Message-ID	<CIVUl-1lo-3@gated-at.bofh.it> (permalink)
References	(5 earlier) <CIRQJ-7vr-1@gated-at.bofh.it> <CIV7X-QV-1@gated-at.bofh.it> <CIVAZ-1fl-3@gated-at.bofh.it> <CIVAZ-1fl-1@gated-at.bofh.it> <CIVKF-1it-3@gated-at.bofh.it>
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> >> find . -type d -exec chmod -v 0644 '{}' \;

> > Use + instead of \; to make them more efficient.

> What does + make as a difference ?

It's a replacement for xargs, except that it actually works, unlike
xargs, which is horribly broken without GNU extensions.

find . -type d -exec chmod 755 {} +

is equivalent to

find . -type d -print0 | xargs -0 chmod 755

except that the former is (a) faster, (b) shorter, and (c) POSIX standard.

Both of them try to minimize the number of separate calls to chmod, by
bundling up a bunch of filenames and passing them all at once.

The \; command calls chmod one time for every directory.

There are valid reasons to use the \; form (e.g. when your command can
only handle one filename at a time), and there are valid reasons to
use the -print0 | xargs -0 form (e.g. when you want to parallelize,
which is another GNU xargs extension).  But in this particular case,
the -exec + command is the best choice.

Thread

Bash script problem "Gary L. Roach" <garyroach719@gmail.com> - 2021-08-05 02:00 +0200
  Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-05 02:10 +0200
    Re: Bash script problem "Gary L. Roach" <garyroach719@gmail.com> - 2021-08-05 05:50 +0200
      Re: Bash script problem john doe <johndoe65534@mail.com> - 2021-08-05 09:00 +0200
      Re: Bash script problem <tomas@tuxteam.de> - 2021-08-05 10:10 +0200
        Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-05 13:20 +0200
          test vs. [ [was: Bash script problem] <tomas@tuxteam.de> - 2021-08-05 14:00 +0200
            Re: test vs. [ [was: Bash script problem] Greg Wooledge <greg@wooledge.org> - 2021-08-05 14:40 +0200
              Re: test vs. [ [was: Bash script problem] <tomas@tuxteam.de> - 2021-08-05 15:00 +0200
      Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-05 14:30 +0200
  Re: Bash script problem Anssi Saari <as@sci.fi> - 2021-08-05 09:40 +0200
    Re: Bash script problem Tixy <tixy@yxit.co.uk> - 2021-08-05 10:30 +0200
      Re: Bash script problem <tomas@tuxteam.de> - 2021-08-05 10:40 +0200
        Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-05 14:00 +0200
          Re: Bash script problem "Gary L. Roach" <garyroach719@gmail.com> - 2021-08-05 22:10 +0200
            Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-05 22:20 +0200
              Re: Bash script problem "Gary L. Roach" <garyroach719@gmail.com> - 2021-08-06 17:00 +0200
                Re: Bash script problem <tomas@tuxteam.de> - 2021-08-06 17:10 +0200
            Re: Bash script problem David <bouncingcats@gmail.com> - 2021-08-06 01:40 +0200
              Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-06 02:10 +0200
                Re: Bash script problem Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-06 02:20 +0200
                Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-06 02:30 +0200
                Re: Bash script problem The Wanderer <wanderer@fastmail.fm> - 2021-08-06 03:50 +0200
                Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-06 04:10 +0200
              Re: Bash script problem Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-08-06 02:10 +0200
                Re: Bash script problem Christian Groessler <chris@groessler.org> - 2021-08-06 02:30 +0200
                Re: Bash script problem Christian Groessler <chris@groessler.org> - 2021-08-06 03:00 +0200
                Re: Bash script problem Greg Wooledge <greg@wooledge.org> - 2021-08-06 03:10 +0200
                Re: Bash script problem David <bouncingcats@gmail.com> - 2021-08-06 03:10 +0200
                Re: Bash script problem David <bouncingcats@gmail.com> - 2021-08-06 03:00 +0200
                Re: Bash script problem <tomas@tuxteam.de> - 2021-08-06 09:00 +0200
              Re: Bash script problem David Wright <deblis@lionunicorn.co.uk> - 2021-08-06 05:10 +0200
                Re: Bash script problem David <bouncingcats@gmail.com> - 2021-08-06 05:50 +0200
              Re: Bash script problem Darac Marjal <mailinglist@darac.org.uk> - 2021-08-06 09:20 +0200
  Re: Bash script problem Tom Browder <tom.browder@gmail.com> - 2021-08-06 01:00 +0200

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