I wrote something like this a long time ago but forgot what I did.

I have a application that generates a bunch of console output during
startup and then finally prints out a message like "Server started."
when done.

I want a startup script that will go into a while loop and grep for the
"Server started" string. One is sees that, echos a message to the screen
and exits. I am also running this command from a nohup so the script
will actually need to monitor nohup.out for the startup string.

I have the entire script written with the exception of the while loop.

Can anyone help me out? My bash is a bit rusty.

Thx
-CC

In article <3F0DEAE2.5030705@echeeba.com>,
Big Chuck <ccarson@echeeba.com> wrote:
>
>I wrote something like this a long time ago but forgot what I did.
>
>I have a application that generates a bunch of console output during
>startup and then finally prints out a message like "Server started."
>when done.
>
>I want a startup script that will go into a while loop and grep for the
>"Server started" string. One is sees that, echos a message to the screen
>and exits. I am also running this command from a nohup so the script
>will actually need to monitor nohup.out for the startup string.
>
>I have the entire script written with the exception of the while loop.
>
>Can anyone help me out? My bash is a bit rusty.

while read line
do
if [[ $line = "Server started." ]]
then echo "It's started!"
break
fi
done < nohup.out

--
Barry Margolin, barry.margolin@level3.com
Level(3), Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.

Barry Margolin wrote:
>
> In article <3F0DEAE2.5030705@echeeba.com>,
> Big Chuck <ccarson@echeeba.com> wrote:
> >
> >I want a startup script that will go into a while loop and grep for the
> >"Server started" string. One is sees that, echos a message to the screen
> >and exits. I am also running this command from a nohup so the script
> >will actually need to monitor nohup.out for the startup string.
> >
> >I have the entire script written with the exception of the while loop.
> >
> >Can anyone help me out? My bash is a bit rusty.
>
> while read line
> do
> if [[ $line = "Server started." ]]
> then echo "It's started!"
> break
> fi
> done < nohup.out

If the "nohup.out" file is being added to while the script is run, as
the OP would seem to indicate, that will not work, as it will terminate
when it comes to the end of nohup.out as it then exists. It should be
something like:

tail +1f nohup.out | while read line
do
echo $line | egrep -s "Server started" && break
done
echo "It's started"

if "Server started" is only part of the message, or

tail +1f nohup.out | while read line
do
[[ "$line" = "Server started" ]] && break
done
echo "It's started"

if the line is guaranteed to contain only "Server started", so that it
tracks nohup.out while is is being created.

John Howells