Check my Script and Say what Grinds Your Gears Post: 303025935

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Top Forums Shell Programming and Scripting Check my Script and Say what Grinds Your Gears Post 303025935 by boqsc on Thursday 15th of November 2018 12:04:26 PM

11-15-2018

Registered User

Check my Script and Say what Grinds Your Gears

This is a script that I, this unix forum and stackoverflow come up with. I would like to get some feedback about it and improve it little bit if possible for even more readability and better working. OR get some shaming hilarious opinion.

Quote:

What this script does?
It checks whether this Script is ran with Bash shell.
If it did not, the notice will be echo'ed.
And the Script rerun with Bash.

Later:
It will check whether this Script is ran by the User that can execute Sudo directly or will be promped for a password.
The notice will be echo'ed.

Little bit more Later:

It will check if the User that executes this Script ran the Script with Sudo.
If Not, this script will be re-run with Sudo and Bash.

Code:

#!/bin/bash
currentShell=$(readlink /proc/$$/exe);
if [ "$currentShell" != "/bin/bash" ]
then 
        echo 'The script is ran by different shell, not Bash shell, be cautious next time.';
        echo 'I will rerun this script with Bash shell for You, to avoid unusual behaviour';
        exec bash "$0" "$@";
fi

declare sudoPasswordCache=$((sudo -n true) 2>&1);
if [ "$sudoPasswordCache" = "sudo: a password is required" ];
then 
        echo ""
        echo 'This script is required to be ran as root user.';
        echo 'You will be asked for a password';
        #else echo 'You have a cached password in place, no need for password.'
fi

if [ "$EUID" -ne 0 ];
then
        exec sudo bash "$0" "$@";
        echo "exec failed" >&2
        exit 1;
fi

Last edited by boqsc; 11-15-2018 at 01:22 PM..

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xlator_call

xlator_call(8)						      System Manager's Manual						    xlator_call(8)

Name
       xlator_call - shell script to invoke PostScript translators

Syntax
       xlator_call datatype orientation pagesize width length indent

Description
       This  Bourne  shell script can be called by the line printer daemon to invoke the appropriate translator to convert each data type to Post-
       Script.	The data type passed by may be specified by using the command with the -Ddatatype option, or by using the  Da=datatype	capability
       in the file.

       For a file in a data syntax to be translated to PostScript, the script must contain a case branch which recognizes the data type string and
       calls a suitable filter.  The supplied recognizes the ANSI, ASCII, ReGIS and Tektronix 4014 data types.

Arguments
       datatype
       The valid data types are: or any other for which a translator has been installed.

       orientation
       The valid orientations are: portrait or landscape.

       pagesize
       The valid page sizes are: or

       width
       The width (in characters) of the page.

       length
       The length (in lines) of the page.

       indent
       The amount (in spaces) the output is to be indented.

       All the valid arguments are described in detail by the reference page.

Examples
       An example shell script is shown below:
       case $datatype in
       ansi)
	    exec ansi_ps -F $pagesize -O $orientation -e "$@";;
       ascii)
	    echo "(04) cvn {} def"
	    exec ln03rof -w$width -l$length -i$indent;;
       postscript)
	    exec cat;;
       tek4014)
	    exec tek4014_ps -F $pagesize -O $orientation;;
       regis)
	    exec regis_ps -F $pagesize -O $orientation;;
       *)
	    echo "$0: Translator for data type $datatype not installed" >&2
       esac

       When the shell script is called, the path searched is:
       /usr/local/lib/lpdfilters:/usr/ucb:/bin:/usr/bin:
				   /usr/lib:/usr/lib/lpdfilters

Files
       The				       script

See Also
       lno3rof(8), printcap(5), ansi_ps(8), lpd(8)

																    xlator_call(8)