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Full Discussion: Help with grep to show date/time of file
Top Forums UNIX for Beginners Questions & Answers Help with grep to show date/time of file Post 303045375 by RudiC on Wednesday 18th of March 2020 05:19:57 PM
Old 03-18-2020
No surprise. If the grep "command substitution" delivers the "empty" value, ls-l uses the default: . . man ls:
Quote:
DESCRIPTION
List information about the FILEs (the current directory by default).
Add a certainly non-existent file name (difficult to find, as there are almost no restrictions on file names), and suppress stderr output:

Code:
ls -l $(grep -il "corrupt" *) FALSE 2>/dev/null


EDIT: or, check the grep result upfront, and just don't call ls if empty...
Last edited by RudiC; 03-18-2020 at 06:33 PM..
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT DEBIAN

dgrep

DGREP(1)						   Debian-goodies documentation 						  DGREP(1)

NAME

       dgrep, degrep, dfgrep, dzgrep -- grep through files belonging to an installed Debian package

SYNOPSIS

       dgrep [most grep options] pattern package...

       dgrep --help

DESCRIPTION

       dgrep invokes grep(1) on each file in one or more installed Debian packages.

       It passes the package argument(s) to dglob(1) to retrieve a list of files in those packages. You can use POSIX regular expressions for the
       package names.

       If dgrep is invoked as degrep, dfgrep or dzgrep then egrep(1), fgrep(1) or zgrep(1) is used instead of grep.

OPTIONS

       dgrep supports most of grep(1)'s options. Please refer to your grep documentation (i.e. the manpage or the texinfo manual) for a complete
       listing. Only a few options are excluded because they do not conform with the intended behaviour, see the list below.

   Options of grep that are not supported by dgrep
       -r, --recursive, -d recurse, --directories=recurse
       -d read, --directories=read
	   dgrep searches only in the "normal" files of a package. It skips all directories and symlinks. Therefor the options of grep that are
	   specific to directories are not supported.

AUTHOR

       Matt Zimmerman <mdz@debian.org>

       This manpage was written by Frank Lichtenheld <frank@lichtenheld.de>.

COPYRIGHT AND LICENCE

       Copyright (C) 2001 Matt Zimmerman <mdz@debian.org>.

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2, or (at your option) any later version.

       On Debian systems, a copy of the GNU General Public License may be found in /usr/share/common-licenses/GPL.

SEE ALSO

       grep(1), egrep(1), fgrep(1), zgrep(1), dglob(1), regex(7), dpkg(8)

perl v5.14.2							    2012-03-21								  DGREP(1)
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