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Top Forums Shell Programming and Scripting Help scripting to start, check, and restart processes Post 302532979 by neutronscott on Thursday 23rd of June 2011 09:50:18 AM
Old 06-23-2011
Quote:
Originally Posted by MacG32
Thank you very much neutronscott for your help, this has worked like a charm. Looks like I was way off. Thanks again. Smilie
There's just many different ways it can be solved. Instead of keeping a PID file (my original trial) I just ask screen if the session is running. It makes it so elegant, eh? Smilie

Thanks for the Thanks! Smilie

---------- Post updated 06-23-11 at 09:50 AM ---------- Previous update was 06-22-11 at 02:13 PM ----------

Oh man, I couldn't sleep last night because I was thinking I didn't test all cases. So first thing today I run 'chkscreen' while attached to 'server1' session and I was right. bug Smilie

Sorry. Using '-r' checks if there is a session you can attach to, which is false if you're already attached.

So change

Code:
# does the session exist?
screen -r $SESSION -ls -q 2>&1 >/dev/null

to read

Code:
# does the session exist?
screen -S $SESSION -ls -q 2>&1 >/dev/null

And it shouldn't start extra servers when you're viewing the screen anymore. Sorry.
This User Gave Thanks to neutronscott For This Post:
 

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sb2-session(1)						       sb2-session man page						    sb2-session(1)

NAME
sb2-session - manage scratchbox2 sessions SYNOPSIS
sb2-session [COMMAND [PARAMS]] DESCRIPTION
sb2-session is used to create attachable scratchbox2 sessions. You can save session even when you haven't done '-S session' during sb2 startup. Note that you can give parameters to attach command which are passed verbatim to sb2. If there is only one session to attach, it is selected automatically. If no command is given, help text is printed. COMMANDS
help shows help text save saves current session list lists detached sb2 sessions delete SESSION deletes given session attach [SESSION [PARAMS]] attaches to a given session setenv VARIABLE VALUE store a value for an environment variable showenv show stored environment variables EXAMPLES
Basic usage is: [SB2 .. ] $ sb2-session save # save session [SB2 .. ] $ ^D # exit Later we can then attach to this session: % sb2-session attach If there are more than one saved session, then: % sb2-session list session.XXXX TARGET_ARM My Comment session.YYYY TARGET_ARM My Comment 2 session.ZZZZ TARGET_MIPS % sb2-session attach session.YYYY Here we pass '-eR' to sb2 and we only have one saved session: % sb2-session attach -- -eR '--' marks end of parameter list for sb2-session. setenv VARIABLE VALUE can be used to add environment variables, that will become active when a saved session is later taken into use (either by sb2-session attach or by sb2 -J). setenv VARIABLE VALUE does not change environment of sessions that are already active. showenv lists environment variable settings which have been stored with this tool. It does not show environment variables from other sources. SEE ALSO
sb2(1) AUTHOR
Mika Westerberg 2.2 21 December 2010 sb2-session(1)
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