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Full Discussion: Verification on shell script
Top Forums Shell Programming and Scripting Verification on shell script Post 302855579 by gacanepa on Friday 20th of September 2013 10:26:15 AM
Old 09-20-2013
I insist that checking the existence of a file is not the best way to allow or deny its execution.
What I would do is wget the file, then if that command completed successfully I'd start the download operation, otherwise I'd show the error message, more like so:
Code:
wget $MIRROR/pack76.sh
	if [ $? == 0 ]
	then
		sh pack76.sh
	else
		echo -e "$RED The download cannot be performed $RESET"
	fi

Hope it helps.
This User Gave Thanks to gacanepa For This Post:
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LEARN ABOUT DEBIAN

ketchup

KETCHUP(1)						      General Commands Manual							KETCHUP(1)

NAME

       ketchup - Utility to update the kernel source

SYNOPSIS

       ketchup [options] <ver>

DESCRIPTION

       This tool synchronises a local kernel tree with a desired kernel version and patch set from a kernel.org mirror. The default requires a GPG
       key on your keyring, to verify the identity of the patches and source archives. Entire kernel images are not downloaded	unless	necessary,
       so bandwidth is saved.  Patches are applied and removed as necessary to attain the requested version.

OPTIONS

       -a --archive (~/.ketchup)

	      cache directory

       -d --directory (.)

	      directory to update

       -f --full-tarball

	      if unpacking a tarball, download the latest

       -g --gpg-path (/usr/bin/gpg)

	      path for GnuPG

       -G --no-gpg

	      disable GPG signature verification

       -k --kernel-url (http://www.kernel.org/pub/linux/kernel)

	      base url for kernel.org mirror

       -l --list-trees

	      list supported trees

       -m --show-makefile

	      output version in makefile <arg>

       -n --dry-run

	      don't download or apply patches

       -o --only-dl

	      don't apply patches

       -p --show-previous

	      output version previous to <arg>

       -q --quiet

	      reduce output

       -r --rename-directory

	      rename updated directory to linux-<v>

       -s --show-latest

	      output the latest version of <arg>

       -u --show-url

	      output URL for <arg>

       -w --wget (/usr/bin/wget)

	      command to use for wget

CONFIGURATION

       Ketchup will read files named .ketchuprc in $HOME and in the target kernel directory, with the kernel directory taking precedence.

       A .ketchuprc file uses the Python syntax and may set the following variables:

       default_tree

	      The default_tree option specifies the kernel version to work with if one is not given on the command line.

       precommand

	      The precommand option specifies a command to run before synchronising the kernel tree to the required version.

       postcommand

	      The postcommand option specifies a command to run after synchronising the kernel tree to the required version.

AUTHOR

       ketchup was written by Matt Mackall <mpm@selenic.com>.

       This manual page was written by Baruch Even <baruch@debian.org>, for the Debian project (but may be used by others). Description text taken
       from a former packaging attempt of Jack Wasey <debian@jackwasey.com>.

								 February 16, 2010							KETCHUP(1)
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