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Full Discussion: False positive grep?
Top Forums Shell Programming and Scripting False positive grep? Post 303045952 by MadeInGermany on Sunday 19th of April 2020 08:21:18 AM
Old 04-19-2020
That explains it; and your photo shows a non-ascii character.
It's not sufficient to sort out [a-zA-Z].

With an ERE you can ensure the input is a number:
Code:
[[ $NUM =~ ^[0-9]+$ ]] || continue
echo "$NUM is a positive integer"

Code:
[[ $NUM =~ ^-?[0-9]+$ ]] || continue
echo "$NUM is an integer"

RHS == right hand side
This User Gave Thanks to MadeInGermany For This Post:
 

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SDIFF(1)							   User Commands							  SDIFF(1)

NAME
sdiff - side-by-side merge of file differences SYNOPSIS
sdiff [OPTION]... FILE1 FILE2 DESCRIPTION
Side-by-side merge of file differences. -o FILE --output=FILE Operate interactively, sending output to FILE. -i --ignore-case Consider upper- and lower-case to be the same. -E --ignore-tab-expansion Ignore changes due to tab expansion. -b --ignore-space-change Ignore changes in the amount of white space. -W --ignore-all-space Ignore all white space. -B --ignore-blank-lines Ignore changes whose lines are all blank. -I RE --ignore-matching-lines=RE Ignore changes whose lines all match RE. --strip-trailing-cr Strip trailing carriage return on input. -a --text Treat all files as text. -w NUM --width=NUM Output at most NUM (default 130) print columns. -l --left-column Output only the left column of common lines. -s --suppress-common-lines Do not output common lines. -t --expand-tabs Expand tabs to spaces in output. --tabsize=NUM Tab stops are every NUM (default 8) print columns. -d --minimal Try hard to find a smaller set of changes. -H --speed-large-files Assume large files and many scattered small changes. --diff-program=PROGRAM Use PROGRAM to compare files. -v --version Output version info. --help Output this help. If a FILE is `-', read standard input. Exit status is 0 if inputs are the same, 1 if different, 2 if trouble. AUTHOR
Written by Thomas Lord. REPORTING BUGS
Report bugs to <bug-gnu-utils@gnu.org>. COPYRIGHT
Copyright (C) 2004 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for sdiff is maintained as a Texinfo manual. If the info and sdiff programs are properly installed at your site, the command info diff should give you access to the complete manual. diffutils 2.8.7 April 2004 SDIFF(1)
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