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Full Discussion: grep files without header and move to new dir
Top Forums Shell Programming and Scripting grep files without header and move to new dir Post 302221644 by era on Tuesday 5th of August 2008 01:14:31 AM
Old 08-05-2008
One of the main purposes of the exit code of a program is that this is what the shell's conditionals like while and if examine. So the exit code should reflect whether or not there was success (0 means yes, any other number means no).

And as usual, the proper idiomatic way to write the above conditional is to use the command directlly in the if, and avoid the Useless Use of Test, like this:

Code:
if chk_headers; then
    : nothing
else
    exitcode=$?
    echo $0: Error $exitcode in chk_headers >&2
    exit $exitcode
fi

exit 0

Notice the redirection of the error message to standard error, and the propagation of the exit code from chk_headers to any calling script. Also the error message indicates which program printed it, for somewhat improved usability.
 

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LEARN ABOUT CENTOS

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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