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Full Discussion: date caculation
Top Forums Shell Programming and Scripting date caculation Post 302338577 by aigles on Tuesday 28th of July 2009 10:10:37 AM
Old 07-28-2009
Have a look at https://www.unix.com/answers-frequent...rithmetic.html

Jean-Pierre.

---------- Post updated at 16:10 ---------- Previous update was at 16:04 ----------

With GNU date command, you can do :
Code:
$ cat date.sh
a=20090728
b=$(date --date="$a+4days" +'%Y%m%d')
echo "$a + 4days = $b"
$ ./date.sh
20090728 + 4days = 20090801
$

Jean-Pierre.
 

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grub-render-label

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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