Re: [SLUG] Weekly celebration of a Unix utility
On Sat, Jan 10, 2004 at 04:47:18AM +1100, Michael Kraus wrote: G'day... I am using now quite often the -v option to grep since I learnt of that one. It removes a pattern from the imput to grep. Quite useful. Especially when checking for the existence of a process running... For example: # ps -xwa | grep process-name | grep -v grep I like this bit of cleverness: # ps -xwa | grep [p]rocess-name This pattern will match what you're after but won't match itself. So, no need to grep -v grep! BTW, linux has the pgrep command now. Much nicer to use that grep'ing ps output. -- Matt -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
G'day... I am using now quite often the -v option to grep since I learnt of that one. It removes a pattern from the imput to grep. Quite useful. Especially when checking for the existence of a process running... For example: # ps -xwa | grep process-name | grep -v grep This will remove the grep process itself from the resultant output... Ie. # ps -xwa | grep process-name will give the output: 5123 process-name 7843 grep process-name Whilst the former command will only output the first line.. And lets not forget the gnu tools of cut, paste, split and sort are fantastic - very great for text manipulation and hunting through logs. All the best... Mike -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
Hey hey. Michael Kraus wrote: Especially when checking for the existence of a process running... For example: # ps -xwa | grep process-name | grep -v grep This will remove the grep process itself from the resultant output... You can save yourself a lot of typing by doing this as: $ ps -xwa | grep [p]rocess-name The shell will convert [p]rocess-name to process-name when it feeds it to grep (I don't remember what the square brackets actually mean to the shell). But grep will still see [p]rocess-name in the ps output. And of course those two strings are completely different. :-) And lets not forget the gnu tools of cut, paste, split and sort are fantastic - very great for text manipulation and hunting through logs. I have occasional holy wars at work about cut,past,split vs. awk,sed. Pointing out things like the sed implementation of sokoban[1] is usually a good way to win, though. :-) -- Pete [1] http://sed.sourceforge.net/local/games/sokoban.sed -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] Weekly celebration of a Unix utility
* dnstrace. As useful as ping, nc, and traceroute for troubleshooting,
and one of the only tools I've ever seen to show how DNS works in a
simple manner.
* seq. prints out sequences of numbers. First taught to me with the
following magic:
for y in $(seq 1970 2003)
do
for m in $(seq 1 12)
wget http://blahblahblahplaymate${y}-${m}.png
done
done
Mike
--
Mike MacCana [EMAIL PROTECTED]
--
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Re: [SLUG] Weekly celebration of a Unix utility
On Thu, 2004-01-08 at 16:21, Michael Chesterton wrote: DE LUCA Ben [EMAIL PROTECTED] writes: There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! screen can be used as a login shell. But scp didn't like it, bummer, I'm testing out putting screen -xRR at the end of .bash_profile, I haven't noticed any problems yet. if scp doesn't like it, it'll be because you didn't make it non-tty clean. to test that - make screen your login shell again, and run ssh -T echo foo If you see /anything/ other than echo foo, scp will not work. Rob -- GPG key available at: http://www.robertcollins.net/keys.txt. signature.asc Description: This is a digitally signed message part -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
Robert Collins [EMAIL PROTECTED] writes: screen can be used as a login shell. But scp didn't like it, bummer, I'm testing out putting screen -xRR at the end of .bash_profile, I haven't noticed any problems yet. if scp doesn't like it, it'll be because you didn't make it non-tty clean. to test that - make screen your login shell again, and run ssh -T echo foo If you see /anything/ other than echo foo, scp will not work. Thanks. I don't know what non-tty clean means exactly, but I think I get your drift. I did a little googling, first hit said the reason it doesn't work is a feature[1]. They recommended testing if it's an interactive shell, and execing screen. Which is basically what I'm doing. As long as I don't have to type screen every time I login, I'm happy. :) 1. I use that all the time. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
Stuart Cooper wrote: I was wondering if people would like to talk about some of the things that you might be able to do with some simple utilities that are included with most Linux distros. Quite often the Linux versions of Unix standard programs come from the GNU project and are completely packed with new and useful features. Two of my favourites: 1) -h option (human readable) in df and du commands 2) less pager F option to go into tail -f mode of a logfile you are looking at; which can then be changed back to regular less with an interrupt key I am using now quite often the -v option to grep since I learnt of that one. It removes a pattern from the imput to grep. Quite useful. -- Mike Lake Caver, Linux enthusiast and interested in anything technical. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
Hello boys and girls What I was really hoping for with my initial mail is that each week we might focus on a different utility. There are so many GNU utilities that I though we might sacrifice a whole week to each one. I know that I have been surprised with what can be done with some utilities More that I thought was possible more than I could imagine. I thought this might be a good opportunity for the newbies (IE any one with less than 20 years of unix experience :) ooh that¹s me) to Learn some great tricks with things that the xPerts know already! Are you guys in? :P Argh flyday afternoon! Next week lets no talk about screen lets talk about some thing else? How do you guys feal about showing off your `find` skills from Monday? -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] Weekly celebration of a Unix utility
I was wondering if people would like to talk about some of the things that you might be able to do with some simple utilities that are included with most Linux distros. I spent a few days over the holidays learning more about screen and I can say it was truly worth it. I was wondering if a few people might like to join me in discussing some of the cool things about a particular utility each week? There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
This one time, at band camp, DE LUCA Ben [EMAIL PROTECTED] wrote: There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! Sure, lets begin with VI :) Kevin -- __ (_ \ _) ) | / / _ ) / _ | / ___) / _ ) | | ( (/ / ( ( | |( (___ ( (/ / |_| \) \_||_| \) \) Kevin Waterson Port Macquarie, Australia -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
I was wondering if people would like to talk about some of the things that you might be able to do with some simple utilities that are included with most Linux distros. Quite often the Linux versions of Unix standard programs come from the GNU project and are completely packed with new and useful features. Two of my favourites: 1) -h option (human readable) in df and du commands 2) less pager F option to go into tail -f mode of a logfile you are looking at; which can then be changed back to regular less with an interrupt key Since so many Linux programs are so configurable and options-packed it's well worth the trouble of reading all about your favourites. Stuart. http://personals.yahoo.com.au - Yahoo! Personals New people, new possibilities. FREE for a limited time. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
I tried to reply directly but apparently my company is filled with SPAMERS! Um, I was thinking we might start with screen! its much more use than vi ! From: Kevin Waterson [EMAIL PROTECTED] Organization: Oceania Date: Thu, 8 Jan 2004 15:22:36 +1100 To: [EMAIL PROTECTED] Subject: Re: [SLUG] Weekly celebration of a Unix utility This one time, at band camp, DE LUCA Ben [EMAIL PROTECTED] wrote: There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! Sure, lets begin with VI :) Kevin -- __ (_ \ _) ) | / / _ ) / _ | / ___) / _ ) | | ( (/ / ( ( | |( (___ ( (/ / |_| \) \_||_| \) \) Kevin Waterson Port Macquarie, Australia -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
I was going to talk about screen this week. One of the most useful things I think it can do is split a console up into two viewable/able editable areas you can do this with the ctrl-S option! Its great for watching a log whilst you do other things on the computer. From: Stuart Cooper [EMAIL PROTECTED] Date: Thu, 8 Jan 2004 15:47:52 +1100 (EST) To: DE LUCA Ben [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: Re: [SLUG] Weekly celebration of a Unix utility I was wondering if people would like to talk about some of the things that you might be able to do with some simple utilities that are included with most Linux distros. Quite often the Linux versions of Unix standard programs come from the GNU project and are completely packed with new and useful features. Two of my favourites: 1) -h option (human readable) in df and du commands 2) less pager F option to go into tail -f mode of a logfile you are looking at; which can then be changed back to regular less with an interrupt key Since so many Linux programs are so configurable and options-packed it's well worth the trouble of reading all about your favourites. Stuart. http://personals.yahoo.com.au - Yahoo! Personals New people, new possibilities. FREE for a limited time. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
On Thu, 2004-01-08 at 16:15, DE LUCA Ben wrote: I was going to talk about screen this week. One of the most useful things I think it can do is split a console up into two viewable/able editable areas you can do this with the ctrl-S option! Its great for watching a log whilst you do other things on the computer. Just to continue my current obsession with obscure commands, did you know you can also do this with splitvt? :-) -- Pete -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
quote who=DE LUCA Ben I tried to reply directly but apparently my company is filled with SPAMERS! (Yes, I've seen this - Kevin's mail server does seem to reject a lot of mail.) - Jeff -- linux.conf.au 2004: Adelaide, Australia http://lca2004.linux.org.au/ 'unf' is walking into a door. 'untz' is walking into a drum kit. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
DE LUCA Ben [EMAIL PROTECTED] writes: There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! screen can be used as a login shell. But scp didn't like it, bummer, I'm testing out putting screen -xRR at the end of .bash_profile, I haven't noticed any problems yet. -xRR is my favourite way of starting screen, -x Attach to a not detached screen session. (Multi display mode). -x is handy with working with someone remotely who is learning the ropes, the screen is mirrored, they see what you see and type, you see what they see and type. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Weekly celebration of a Unix utility
On Thu, Jan 08, 2004 at 03:22:04PM +1100, DE LUCA Ben wrote: I was wondering if people would like to talk about some of the things that you might be able to do with some simple utilities that are included with most Linux distros. I spent a few days over the holidays learning more about screen and I can say it was truly worth it. I was wondering if a few people might like to join me in discussing some of the cool things about a particular utility each week? There was some talk of screen earlier this week and I wondered if we might like to talk about some of the cool functions or even bad ones for the rest of the week! Screen is very worthy, but pipe is da bomb! (Pipe-Bomb?) cat Zechariah\ Vulgate.txt | perl -lane'print lynx -source http://www.perseus.tufts.edu/cgi-bin/morphindex?lang=la\\embed=2\\lookup=$F[$_] | grep \\G\\ | perl -pe \s\/\\.*?\\\/;\/g; print qq[$F[0].$_;$F[$_];];\ foreach 1..$#F' | sh | cut '-d;' -f1,2,8,13 | perl -nle'my ($vw,$mw,$dw,$dd) = split(/\;/); $dd =~ s/^Entry in $//;$dd = \$dd\;print qq[$vw $mw : $dw$dd]' This little beauty took the Latin words from the Vulgate version of the book of Zechariah (Old Testament), plugged them into a webpage which gave the alternate meanings, ripped out the meanings and re-formatted them into one Latin word and alternate meaning per line, so my friend (PHD at Sydney Uni) could remove the wrong meanings and have a word for word translation. Pipe lets you build up programs on the command line, tie together simple tools (grep/cut/sed/awk/lynx/wget/sh/perl/convert) and see how you are going. I particularly like getting perl to print out commands which I pipe to sh. If you want to get started, try: a one-liner which sets todays dilbert comic as your background image in x. splitting a logfile into daily or hourly logfiles using grep, bc, head, tail cheers, Woody -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
