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Re: Extract substring from cat

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On Fri, Oct 16, 2015 at 03:14:31PM +0200, tomas@tuxteam.de wrote:
> On Fri, Oct 16, 2015 at 02:54:25PM +0200, Nemeth Gyorgy wrote:
> > 2015-10-16 14:15 keltezéssel, Alfred Charles Stockton írta:
> > cat /etc/*-release | grep ^PRETTY_NAME | sed 's/^.*=//'
> 
> Many insightful answers have been given. Yours is an example of "useless
> use of cat" [1], better spelt as
>
>   grep ^PRETTY_NAME /etc/*-release | sed 's/^.*=//'
> 
> Even better, since sed can do grep:
> 
>   sed -ne '/^PRETTY_NAME=/ s/^.*=// p' < /etc/*-release

Not if there may be more than one file matching the pattern. In that
case at least your "better" example breaks. It can be fixed by
omitting "<".


Kurt

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Thread

Extract substring from cat "Alfred Charles Stockton" <alf@devacs.za.net> - 2015-10-16 14:50 +0200
  Re: Extract substring from cat Nemeth Gyorgy <friczy@freemail.hu> - 2015-10-16 15:00 +0200
    Re: Extract substring from cat <tomas@tuxteam.de> - 2015-10-16 15:50 +0200
      Re: Extract substring from cat Kurt Flex <flxkrt@aol.com> - 2015-10-18 22:00 +0200
        Re: Extract substring from cat tomas@tuxteam.de - 2015-10-18 22:10 +0200
  Re: Extract substring from cat Darac Marjal <mailinglist@darac.org.uk> - 2015-10-16 15:10 +0200
  Re: Extract substring from cat Santiago Vila <sanvila@unex.es> - 2015-10-16 15:30 +0200
  Re: Extract substring from cat "John L. Cunningham" <djohngo@gmail.com> - 2015-10-16 15:30 +0200
  Re: Extract substring from cat Jonathan <winelauncher.jonathan@googlemail.com> - 2015-10-17 01:40 +0200
    Re: Extract substring from cat Cindy-Sue Causey <butterflybytes@gmail.com> - 2015-10-17 03:40 +0200

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