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Top Forums Shell Programming and Scripting Help understanding the script Post 302984019 by Chubler_XL on Wednesday 19th of October 2016 09:34:56 PM
Old 10-19-2016
Sounds like some validation of input is needed.

You could enhance agedays.pl to output "ERROR" if input is invalid:

Code:
#!/bin/perl
use POSIX;
use Time::Local;

my %mon;
@mon{qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/} = 0..11;

my ($mmm, $dd, $yy) = split(/[-\/ ]/, $ARGV[0]);

eval {
  printf "%.0f", (time() - timelocal(0,0,0,$dd,$mon{$mmm}, $yy) - 0.4999) / (24*60*60)
};
printf "ERROR" if $@;


Then test for the "ERROR" result in your script:
Code:
...
while read input
do
  if [[ ${input:9:1} = ':' ]]
  then
     DateStr="${input:0:3} ${input:4:2} $(date +%Y)"
  else
     DateStr="${input:0:3} ${input:4:2} 20${input:10:2}"
  fi
  BackupAge=$(agedays.pl "$DateStr")

  if [ "$BackupAge" = "ERROR" ]
  then
       printf "Illegal date: \"$DateStr\" - skipping line"
       continue
  fi
  ...

 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME
grub-render-label - generate a .disk_label for Apple Macs. SYNOPSIS
grub-render-label [OPTION...] [OPTIONS] DESCRIPTION
Render Apple .disk_label. -b, --bgcolor=COLOR use COLOR for background -c, --color=COLOR use COLOR for text -f, --font=FILE use FILE as font (PF2). -i, --input=FILE read text from FILE. -o, --output=FILE set output filename. Default is STDOUT -t, --text=STRING set the label to render -v, --verbose print verbose messages. -?, --help give this help list --usage give a short usage message -V, --version print program version Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
The full documentation for grub-render-label is maintained as a Texinfo manual. If the info and grub-render-label programs are properly installed at your site, the command info grub-render-label should give you access to the complete manual. grub-render-label (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-RENDER-LABEL(1)
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