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Full Discussion: False positive grep?
Top Forums Shell Programming and Scripting False positive grep? Post 303045949 by MadeInGermany on Sunday 19th of April 2020 05:54:52 AM
Old 04-19-2020
&2>/dev/null is still odd, the & is too many. The & before a descriptor number is needed on the RHS only, to distinguish it from a file name.
And, the only errors that a [[ ]] can produce are "syntax error", "not an integer", "division by zero". You want to see them!
If you want to supress an error from an embedded sub shell expression than redirect it within the sub shell.

In general, only suppress error messages when it makes sense - they help you!

And yes, I meant the
Code:
builtin echo "$NUM" | $GREP -E -q "[a-zA-Z]"  && continue

that should become
Code:
[[ "$NUM" =~ [a-zA-Z] ]] && continue


Last edited by MadeInGermany; 04-19-2020 at 09:24 AM.. Reason: correction: no surrounding *
This User Gave Thanks to MadeInGermany For This Post:
 

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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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