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I want to make a simple script so that the user can easy change the runlevels. The script should prompt the user to choose the new runlevel, run the /sbin/init program and receive a confirmation message.

Any ideas ?

P.S if the runlevel is changed i want to receive a confirmation message. Help please

redcaddy
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    The official command for changing run levels is telinit – Rui F Ribeiro Dec 21 '15 at 10:14
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    Bear in mind that you might be running [an operating system where run levels have been declared "obsolete"](http://unix.stackexchange.com/a/196014/5132) and where [`telinit` is a backwards compatibility command that "should not be used anymore"](http://www.freedesktop.org/software/systemd/man/telinit.html). – JdeBP Dec 21 '15 at 14:10

1 Answers1

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You can try simply,

Create file named myscript with following content:

#!/bin/bash
echo -n "Enter Run level":
read rl;
sudo init $rl;

Where echo is used to print what to input, read is used to get the input and store into variable rl and sudo init $rl; to execute command for changing run level.

For more control/verification over input, you can use loop such as while and case.

You've to give execution permission:sudo chmod +x myscript so that it can be executed.

Then you can run script like:

$ ./myscript
$ Enter Run level : 3

EDIT:

as @RuiFRibeiro suggested, the command to change runlevel is telinit:

NAME
       telinit - change system runlevel

SYNOPSIS
       telinit [OPTION]...  RUNLEVEL

DESCRIPTION
       telinit may be used to change the system runlevel.

So, You should use telinit instead init in script.

And to check run level you can use who -r or runlevel command which output previous and current runlevel.

$ who -r | awk '{print $1,$2}'
run-level 3
$ runlevel
2 3
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Pandya
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