Date: Fri, 10 Mar 2000 08:06:53 -0800 (PST) From: wellsian <wellsian@caffeine.com> To: Jonathan Wall <JW1@mm-croy.mottmac.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: truncating lines with a script... Message-ID: <Pine.BSF.4.21.0003100802180.51091-100000@boris.netgate.net> In-Reply-To: <934E0337010C01E0@smtp-gate.mottmac.com>
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Try the cut(1) command. e.g.: % blah Some normal output from command blah. % blah | cut -c 7-14 ormal ou Dave On Fri, 10 Mar 2000, Jonathan Wall wrote: > Date: Fri, 10 Mar 2000 15:26:00 +0000 > From: Jonathan Wall <JW1@mm-croy.mottmac.com> > To: freebsd-questions@FreeBSD.ORG > Subject: truncating lines with a script... > > Hi there, > > Hopefully somebody can spare a moment to solve a problem I'm having... > > I have a very simple sh script that runs 'ps' via rsh for some machines on > our network and then pipes the output through grep to pick out the lines of > interest - in this case the Xvnc processes. I would like to then pipe the > output through another command to remove the superfluous Xvnc command line > switches the ps command also shows. > > The script as it currently stands is shown below. I thought sed would be > the answer but apart from having an astoundingly cryptic man page, I think > it can only delete whole lines containing a particular string rather than a > segment of a line. I know I could have used 'comm' instead of 'command' in > the script to have a shortened output from ps, but then I can't see which > screen the Xvnc processes are attached to. The typical output is below the > script and given this example I would ideally like to remove everything > after the ':1'. Perhaps I should be using awk or perl ??? > > I'm frustrated to be unable to work this out for myself since it seems so > trivial. Is there a correspondingly trivial solution ?? > > Thanks in advance to anyone who has time to write a reply, > > Jonathan Wall. > > ### My script ### > > #!/bin/sh > echo "" > echo "" > echo "--------------------------------------------------------------" > echo " cfd1" > echo "--------------------------------------------------------------" > rsh cfd1 ps -e -o > user,pid,pcpu,pmem,vsize,rssize,tty,state,start,cputime,etime,command \ > | grep -w -e USER -e Xvnc \ > | grep -v -e grep > echo "--------------------------------------------------------------" > echo " cfd2" > echo "--------------------------------------------------------------" > rsh cfd2 ps -e -o > user,pid,pcpu,pmem,vsize,rssize,tty,state,start,cputime,etime,command \ > | grep -w -e USER -e Xvnc \ > | grep -v -e grep > echo "--------------------------------------------------------------" > echo " cfd3" > echo "--------------------------------------------------------------" > rsh cfd3 ps -e -o > user,pid,pcpu,pmem,vsize,rssize,tty,state,start,cputime,etime,command \ > | grep -w -e USER -e Xvnc \ > | grep -v -e grep > echo "" > echo "" > > > ### Typical output ### (apologies if the long line causes problems for your > email client) > > -------------------------------------------------------------- > cfd1 > -------------------------------------------------------------- > USER PID %CPU %MEM VSZ RSS TTY S STARTED TIME > ELAPSED COMMAND > jw1 2515 0.0 0.5 7.68M 3.7M ttyp4 S 18:43:20 0:00.58 > 1:27 Xvnc :1 -desktop X -httpd /usr/personal/jw1/apps/share/vnc/classes > -auth /usr/personal/jw1/.Xauthority -geometry 1024x768 -depth 16 -rfbwait > 120000 -rfbauth /usr/personal/jw1/.vnc/passwd -rfbport 5901 -fp > /usr/lib/X11/fonts/misc/,/usr/lib/X11/fonts/75dpi/,/usr/lib/X11/fonts/100dpi > /,/usr/lib/X11/fonts/decwin/75dpi/,/usr/lib/X11/fonts/decwin/100dpi/,/usr/li > b/X11/fonts/cde/75dpi/,/usr/lib/X11/fonts/cde/100dpi/,/usr/lib/X11/fonts/use > r/75dpi/,/usr/lib/X11/fonts/user/100dpi/,/usr/lib/X11/fonts/user/misc/,/usr/ > lib/X11/fonts/Speedo/,/usr/lib/X11/fonts/Type1/,/usr/lib/X11/fonts/Type1Adob > e/ > -------------------------------------------------------------- > cfd2 > -------------------------------------------------------------- > USER PID %CPU %MEM VSZ RSS TTY S STARTED TIME > ELAPSED COMMAND > -------------------------------------------------------------- > cfd3 > -------------------------------------------------------------- > USER PID %CPU %MEM VSZ RSS TTY S STARTED TIME > ELAPSED COMMAND > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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