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Re: can you parse and "tail" at once? (and if you can't why not?)

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On Mon, Oct 23, 2023 at 01:21:43PM +0530, Pankaj Jangid wrote:
> Another way to do it is,
> 
> cat "${IFL}"| cut -d "/" -f7-|sed 's/.description//'
> 
> because you already know the prefix, you can count the fields. So "-f7-"
> i.e. 7 onwards. Then use sed to remove the extension.

Whoops!  I completely missed the requirement of removing ".description"
in my original answer.

Here's a corrected version:


#!/bin/bash

inputfile=${1-/whatever}
prefix='[info] 123XYZ: /media/user/1234qwer/Algebraic_Geometry04/20231022040239/'

while IFS= read -r line; do
    line=${line#"$prefix"}
    printf '%s\n' "${line%.description}"
done < <(grep -F -- "$prefix" "$inputfile")


Pankaj's answer is not wrong, but it dropped the "grep" which filters
the lines containing the desired prefix.  I'd also add an $ anchor to
the sed regex, and escape the . with backslash so that it becomes
literal.  This answer also requires counting the fields by hand each
time the prefix changes, which may or may not be a concern.

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Thread

can you parse and "tail" at once? (and if you can't why not?) Albretch Mueller <lbrtchx@gmail.com> - 2023-10-22 18:40 +0200
  Re: can you parse and "tail" at once? (and if you can't why not?) Charles Curley <charlescurley@charlescurley.com> - 2023-10-22 19:10 +0200
    Re: can you parse and "tail" at once? (and if you can't why not?) Greg Wooledge <greg@wooledge.org> - 2023-10-22 19:50 +0200
      Re: can you parse and "tail" at once? (and if you can't why not?) Albretch Mueller <lbrtchx@gmail.com> - 2023-10-22 23:00 +0200
        Re: can you parse and "tail" at once? (and if you can't why not?) Andy Smith <andy@strugglers.net> - 2023-10-22 23:20 +0200
          Re: can you parse and "tail" at once? (and if you can't why not?) gene heskett <gheskett@shentel.net> - 2023-10-23 00:30 +0200
            Re: can you parse and "tail" at once? (and if you can't why not?) Albretch Mueller <lbrtchx@gmail.com> - 2023-10-23 03:40 +0200
              Re: can you parse and "tail" at once? (and if you can't why not?) Greg Wooledge <greg@wooledge.org> - 2023-10-23 04:20 +0200
                Re: can you parse and "tail" at once? (and if you can't why not?) <tomas@tuxteam.de> - 2023-10-23 06:50 +0200
                Shell-script variable name case [WAS: Re: can you parse and "tail" at  once? (and if you can't why not?)] David <bouncingcats@gmail.com> - 2023-10-23 16:00 +0200
              Re: can you parse and "tail" at once? (and if you can't why not?) Andy Smith <andy@strugglers.net> - 2023-10-23 22:10 +0200
        Re: can you parse and "tail" at once? (and if you can't why not?) Patrick Wiseman <pwiseman@gmail.com> - 2023-10-23 04:50 +0200
  Re: can you parse and "tail" at once? (and if you can't why not?) Roberto C. Sánchez <roberto@debian.org> - 2023-10-22 19:50 +0200
  Re: can you parse and "tail" at once? (and if you can't why not?) Andy Smith <andy@strugglers.net> - 2023-10-22 20:00 +0200
  Re: can you parse and "tail" at once? (and if you can't why not?) Pankaj Jangid <pankaj@codeisgreat.org> - 2023-10-23 10:00 +0200
    Re: can you parse and "tail" at once? (and if you can't why not?) Greg Wooledge <greg@wooledge.org> - 2023-10-23 14:20 +0200
      Re: can you parse and "tail" at once? (and if you can't why not?) Albretch Mueller <lbrtchx@gmail.com> - 2023-10-24 00:20 +0200

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