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Full Discussion: Checksum Comparison and listing out the differences
Top Forums Shell Programming and Scripting Checksum Comparison and listing out the differences Post 302886937 by Corona688 on Tuesday 4th of February 2014 11:12:53 AM
Old 02-04-2014
For starters, you can change the useless use of cat and dangerous backticks for i in `cat dir1` ; do ... done into

Code:
while read -r i
do
...
done < dir

And add more error checking, so the script quits instead of spitting errors when given nonsense values or when missing important files. I often use this kind of construct:

Code:
die() { # Print error message and quit, use 'die "string"' or 'die "string" exitcode'
        echo "$1" >&2
        exit ${2-1}
}

# Get input from user
...

[[ -z "$string" ]] && die "String is blank"
[[ -e "filename" ]] || die "filename does not exist"

...

Last edited by Corona688; 02-04-2014 at 12:46 PM..
 

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LEARN ABOUT LINUX

dh_installdeb

DH_INSTALLDEB(1)						     Debhelper							  DH_INSTALLDEB(1)

NAME

       dh_installdeb - install files into the DEBIAN directory

SYNOPSIS

       dh_installdeb [debhelperoptions]

DESCRIPTION

       dh_installdeb is a debhelper program that is responsible for installing files into the DEBIAN directories in package build directories with
       the correct permissions.

FILES

       package.postinst
       package.preinst
       package.postrm
       package.prerm
	   These maintainer scripts are installed into the DEBIAN directory.

	   Inside the scripts, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.

       package.triggers
       package.shlibs
	   These control files are installed into the DEBIAN directory.

       package.conffiles
	   This control file will be installed into the DEBIAN directory.

	   In v3 compatibility mode and higher, all files in the etc/ directory in a package will automatically be flagged as conffiles by this
	   program, so there is no need to list them manually here.

       package.maintscript
	   Lines in this file correspond to dpkg-maintscript-helper(1) commands and parameters.  Any shell metacharacters will be escaped, so
	   arbitrary shell code cannot be inserted here.  For example, a line such as "mv_conffile /etc/oldconffile /etc/newconffile" will insert
	   maintainer script snippets into all maintainer scripts sufficient to move that conffile.

	   A versioned Pre-Dependency on dpkg is needed to use dpkg-maintscript-helper(1). An appropriate Pre-Dependency is set in
	   ${misc:Pre-Depends} ; you should make sure to put that token into an appropriate place in your debian/control file.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

8.9.0ubuntu2.1							    2012-06-12							  DH_INSTALLDEB(1)
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