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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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MP4TRACK(1)							  MP4v2 Utilities						       MP4TRACK(1)

NAME
mp4track - manual page for mp4track - MP4v2 2.0.0 SYNOPSIS
mp4track [OPTION]... [PARAMETERS]... ACTION file... DESCRIPTION
For each mp4 file specified, perform the specified ACTION. An action must be specified. Some options are not applicable to some actions. ACTIONS --list list all tracks in mp4 --enabled BOOL set trak.tkhd.flags (enabled bit) --inmovie BOOL set trak.tkhd.flags (inMovie bit) --inpreview BOOL set trak.tkhd.flags (inPreview bit) --layer NUM set trak.tkhd.layer --altgroup NUM set trak.tkhd.alternate_group --volume FLOAT set trak.tkhd.volume --width FLOAT set trak.tkhd.width --height FLOAT set trak.tkhd.height --language CODE set trak.mdia.mdhd.language --hdlrname STR set trak.mdia.hdlr.name --udtaname STR set trak.udta.name.value --udtaname-remove remove trak.udta.name atom --colr-list list all colr-boxes in mp4 --colr-add add colr-box to a video track --colr-set set colr-box parms --colr-remove remove colr-box from track --pasp-list list all pasp-boxes in mp4 --pasp-add add pasp-box to a video track --pasp-set set pasp-box parms --pasp-remove remove pasp-box from track PARAMETERS --track-any act on any/all tracks --track-index IDX act on track index IDX --track-id ID act on track id ID --colr-parms CSV where CSV is IDX1,IDX2,IDX3 --colr-parm-hd equivalent to --colr-parms=1,1,1 --colr-parm-sd equivalent to --colr-parms=6,1,6 --pasp-parms CSV where CSV is hSPACING,vSPACING OPTIONS -z, --optimize optimize mp4 file after modification -y, --dryrun do not actually create or modify any files -k, --keepgoing continue batch processing even after errors -o, --overwrite overwrite existing files when creating -f, --force force overwrite even if file is read-only -q, --quiet equivalent to --verbose 0 -d, --debug NUM increase debug or long-option to set NUM -v, --verbose NUM increase verbosity or long-option to set NUM -h, --help print brief help or long-option for extended help --version print version information and exit DEBUG LEVELS (for raw mp4 file I/O) 0 supressed 1 add warnings and errors (default) 2 add table details 3 add implicits 4 everything VERBOSE LEVELS 0 warnings and errors 1 normal informative messages (default) 2 more informative messages 3 everything mp4track - MP4v2 2.0.0 June 2012 MP4TRACK(1)
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