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Melsync 09-07-2006 01:23 PM
capture the output to a variable
 
I want to assign the value of a certain pid in order to kill it in a script
Quote:
echo `ps ux | grep dhcpcd | grep -v grep` | cut -d' ' -f2`
gets me the pid number, and only that, all right but then
Quote:
pidno=`echo `ps ux | grep dhcpcd | grep -v grep` | cut -d' ' -f2``
returns 'command not found' and
Quote:
pidno="echo `ps ux | grep dhcpcd | grep -v grep` | cut -d' ' -f2`"
returns the whole string of the output of the command ps.
How can I put the single number in a variable?
Thanks.

acid_kewpie 09-07-2006 01:27 PM
i'm guessing you've not heard aboput the pidof command?
Code:
pidno=$(pidof dhcpcd)
as far as where you're going wrong... take out all the echo stuff. you need to echo it to show the output as a command but you don't need it to assign the output to a vairable.
Code:
pidno=$(ps ux | ... )

homey 09-07-2006 01:51 PM
Other than typo in dhcpd ( dhcpcd ) I would go with
Code:
pidno=$(pidof dhcpd)
echo $pidno
1995
With correct spelling this works also
Code:
pidno=$(echo `ps ux | grep dhcpd | grep -v grep` | cut -d' ' -f2)
echo $pidno
1995

Melsync 09-07-2006 02:15 PM
Thank you, all four solutions work.
Btw, homey, the process is not a typo; I'm using this program: dhcpcd at freshmeat
Thanks again. :)

acid_kewpie 09-07-2006 02:17 PM
Quote:
Originally Posted by Melsync
Thank you, all four solutions work.
Btw, homey, the process is not a typo; I'm using this program: dhcpcd at freshmeat
Thanks again. :)
hehe, bless. dhcpd = dhcp server daemon. dhcpcd = dhcp client daemon.


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