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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LEARN ABOUT SUSE

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-a] [-c COMMAND] [-f] [-q] [-t] [file]

DESCRIPTION

     Script makes a typescript of everything printed on your terminal.	It is useful for students who need a hardcopy record of an interactive
     session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     Options:

     -a      Append the output to file or typescript, retaining the prior contents.

     -c COMMAND
	     Run the COMMAND rather than an interactive shell.	This makes it easy for a script to capture the output of a program that behaves
	     differently when its stdout is not a tty.

     -f      Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super-
	     vise real-time what is being done using `cat foo'.

     -q      Be quiet.

     -t      Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time
	     elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used
	     to replay typescripts with realistic typing and output delays.

     The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
     set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  Script works best with commands that do not manipulate
     the screen, the results are meant to emulate a hardcopy terminal.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism), scriptreplay(1).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     Script places everything in the log file, including linefeeds and backspaces.  This is not what the naive user expects.

AVAILABILITY

     The script command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

Linux								   July 30, 2000							     Linux