Good one. Makes a lot of sense. Thanks for your help. I will read the fine manual as requested.
On Fri, 2008-10-17 at 09:32 +0000, James Attard wrote: > Hi Andrew... > > no need to strace...please do a 'man bash' as I suggested before :p > > What you're probably missing is the behaviour of the quotes `` as a > child shell. Let me give you an example, and I'm sure you'll > understand better: > > test.sh code: > #!/bin/bash > > echo "without quotes" > ps -ef | grep test | grep -v grep > > echo "with quotes" > echo `ps -ef | grep test | grep -v grep` > > > test.sh output: > > /tmp> ./test.sh > without quotes > user 22533 2074 0 11:28 pts/0 00:00:00 /bin/bash ./test.sh > with quotes > user 22533 2074 0 11:28 pts/0 00:00:00 /bin/bash ./test.sh > user 22537 22533 0 11:28 pts/0 00:00:00 /bin/bash ./test.sh > /tmp> > > You see what's happening there? The quotes execute the command in a > subshell. Thus you have a second process running...i.e. use the -gt > 2 ;) > > james > > > > On Thu, Oct 16, 2008 at 4:21 PM, Andrew Cilia <[EMAIL PROTECTED]> > wrote: > > Veerrry Veerry close but not quite. I added a '-h' to the ps > and it looks good now. We still haven't figured out what is > wrong yet though. Header or no header, the grep would have > taken that out. I'm suspecting some leftover junk from procfs > that hasn't been cleaned out yet before ps fetches the info > because if you do it in steps, the problem goes away. > > Who's going to strace this first? > > > > On Thu, 2008-10-16 at 10:18 +0200, Raphael Borg Ellul Vincenti > wrote: > > > Oh.... don't I luv bashisms ... > > > > I slightly rewrote the program and will explain why > > > > #!/bin/bash > > # -C just gives you a list of the processes called what are > > you doing which is more efficient than running multiple > > greps > > # In this case wc -l should always return at least one line > > since ps -C displays a header even when no processes exist > > cntr=$(/bin/ps -C whatareyoudoing | wc -l) > > #make sure cntr is not empty > > if [ "x$cntr" != "x" -a $cntr -gt 1 ]; > > then > > zenity --info --text "Call Logger Is Already Running" > > exit 1 > > fi > > while true > > do > > sleep 15m > > NOW=`date +"%Y|%m|%d|%H|%M|%S"` > > echo $NOW "|" `zenity --text "Attivita' :$NOW" --entry > > --title "X'Qed Tagħmel Man?" --width 1000 --height 5` >> > > $HOME/CALLOG & > > done > > > > exit 0 > > > > Did that help ? > > > > > > On Thu, Oct 16, 2008 at 10:09 AM, Andrew Cilia > > <[EMAIL PROTECTED]> wrote: > > > > Hiyall, > > here's a curious one. I created a batch job > > called whatareyoudoing which contains the text you > > see below. It should be a simple mechanism which > > asks the user what they are doing every 15 minutes > > and has a safeguard so that it does not run more > > than once. The problem is that the very first time I > > run it, it's saying that it's running twice. This > > one has stumped me. Has anyone found anything > > similar?? > > > > #!/bin/bash > > cntr=`/bin/ps ax | /bin/grep whatareyoudoing > > | /bin/grep -v grep | wc -l` > > if [ $cntr -gt 1 ]; > > then > > zenity --info --text "Call Logger Is Already > > Running" > > exit 1 > > fi > > while true > > do > > sleep 15m > > NOW=`date +"%Y|%m|%d|%H|%M|%S"` > > echo $NOW "|" `zenity --text "Attivita' :$NOW" > > --entry --title "X'Qed Tagħmel Man?" --width 1000 > > --height 5` >> $HOME/CALLOG & > > done > > > > > > > > > > The information contained in this email is > > confidential and may be privileged. 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