Runlevel of unix or Linux system

vjackcon · 03-01-2011, 06:46 AM

How do I find out runlevel of unix or Linux system?

repo · 03-01-2011, 06:48 AM

At the prompt type

Code:

runlevel

Kind regards

colucix · 03-01-2011, 06:50 AM

Code:

who -r

devUnix · 03-02-2011, 02:47 PM

Check out this file:

Code:

more /etc/inittab

and here is the extracted info from it:

Code:

grep id /etc/inittab
id:5:initdefault:

Yet more:

Code:

# Default runlevel. The runlevels used by RHS are:
#   0 - halt (Do NOT set initdefault to this)
#   1 - Single user mode
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#   3 - Full multiuser mode
#   4 - unused
#   5 - X11
#   6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:

You can see above how many runlevels are there in Linux and what each of them means.

To enter any other desired runlevel, issue this command:

Code:

init 3

to reboot the system and get into runlevel 3.

To restart:

Code:

init 6

To shutdown:

Code:

init 0

Do not set the above 2 values in the following line:

Code:

id:5:initdefault:

Guess why?

TobiSGD · 03-02-2011, 03:14 PM

Keep in mind that there is no real standard about what to run in which runlevel. For example, Debian is running in runlevel 2 with GUI and network enabled, and runlevels 2-5 are actually all the same.

onebuck · 03-02-2011, 05:46 PM

Hi,

Quote:

Originally Posted by vjackcon

How do I find out runlevel of unix or Linux system?

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Quote:

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archtoad6 · 03-13-2011, 06:05 AM

Quote:

Originally Posted by repo

At the prompt type

Quote:

runlevel

Kind regards

I don't know if using [QUOTE][/QUOTE] tags for a code snippet was deliberate or an accident, I suspect the latter because I don't recall seeing you make that mistake before. Please edit your post to put your code in a Code block, i.e. inside BBcode [CODE][/CODE] tags. Thanks.

Also, FWIW, runlevel doesn't work on my MEPIS 8.0 box, but who -r does.

Code:

$ runlevel
bash: runlevel: command not found

Code:

$ who -r
        run-level 5  2011-03-12 09:44                   last=S

Which works for you, the readers of this thread?

repo · 03-13-2011, 06:15 AM

Quote:

Please edit your post to put your code in a Code block,

Done

Quote:

Also, FWIW, runlevel doesn't work on my MEPIS 8.0 box, but who -r does.

Code:

root@cannabis opt]# runlevel
N 4
root@cannabis opt]#

Code:

root@cannabis opt]# who -r
         run-level 4  Mar 13 10:37                   last=S
root@cannabis opt]#

@aarchtoad6
Just curious, did you marked my post "not helpfull"?

Kind regards

archtoad6 · 03-13-2011, 01:27 PM

Quote:

Originally Posted by repo

...
@archtoad6
Just curious, did you marked my post "not helpfull"?
...

I don't remember doing that, nor do I remember clicking "No" instead of "Yes".

repo · 03-13-2011, 01:30 PM

Quote:

I don't remember doing that, nor do I remember clicking "No" instead of "Yes".

No problem, just wondering.

Kind regards

jschiwal · 03-13-2011, 01:34 PM

Looking at the manpage for "runlevel", it shows three ways of determining the runlevel:
/sbin/runlevel
who -r
The environment variables RUNLEVEL & PREVLEVEL.

On openSUSE
I looked in the service startup scripts in /etc/init.d/ and they use $RUNLEVEL and $PREVLEVEL.
The file /etc/rc.status has a function rc_runlevel() that defines these two variables if they don't exist:

Code:

rc_runlevel()
   395  {
   396      test -z "$RUNLEVEL" || return
   397      set -- $(/sbin/runlevel)
   398      PREVLEVEL=$1
   399      RUNLEVEL=$2
   400      export PREVLEVEL RUNLEVEL
   401  }

If you want to know a runlevel in a startup script, examine startup scripts in your system to see how they do it. Be aware whether the RUNLEVEL and PREVLEVEL environment variables exist when your script is run.