Commands tagged grep (409)
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Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing. Show Sample Output
5ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 -f x11grab -s $(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 10 -i :0.0 -sameq -f mp4 -s wvga -y intro.mp4 -
The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval. Show Sample Output
5grep <something> logfile | cut -c2-18 | uniq -c -
I've been using it in a script to build from scratch proxy servers. Show Sample Output
5ifconfig eth0 | grep "inet " | cut -d ':' -f2 | awk '{print $1}' -
5svn st | grep -e '^M' | awk '{print $2}' | xargs svn revert
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The curl command retrieve the HTML text containing the IP address. The grep command picks out the IP address from that HTML text. Show Sample Output
4curl -s checkip.dyndns.org | grep -Eo '[0-9\.]+' -
4egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' file.txt
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I often use "vim -p" to open in tabs rather than buffers.
4vim $(grep test *) -
xargs -P N spawns up to N worker processes. -n 40 means each grep command gets up to 40 file names each on the command line.
4find . -type f -print0 | xargs -0 -P 4 -n 40 grep -i foobar -
4find . -name "*.[ch]" | xargs grep "TODO"
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This corrects duplicate output from the previous command. Show Sample Output
4netstat -lantp | grep -i establ | awk -F/ '{print $2}' | sort | uniq -
4renice +5 -p $(pidof <process name>)
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Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;) Show Sample Output
4for i in `ls ~/.mozilla/firefox/*/Cache`; do file $i | grep -i mpeg | awk '{print $1}' | sed s/.$//; done -
Works on current directory, with built-in sorting. Show Sample Output
4ls -Xp | grep -Eo "\.[^/]+$" | sort | uniq -
-r recursively -Z zero byte after each file name instead of the usual newline -l only filenames
4grep -r -Z -l "<text>" . | xargs -0 echo rm -
ls -lhR Lists everithing using -l "long listing format" wich includes the space used by the folder. Displays it in -h "human readable form" (i.e. 2.2G, 32K), and -R recurses subfolders. grep -e using a regex, show lines containing the word "total" or a ":" at the end of the line (those with the name of the folder) only. Show Sample Output
4ls -lhR | grep -e "total\|:$" -
4grep -ir string *
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It uses the following GNU grep options: "-o" which shows only the matching part of the line and "-P" which allows the use of Perl regular expressions. Show Sample Output
4ip a | grep -oP '(?<=inet |addr:)(?:\d+\.){3}\d+' -
If you're like me and want to keep all your music rated, and you use xmms2, you might like this command. I takes 10 random songs from your xmms2 library that don't have any rating, and adds them to your current playlist. You can then rate them in another xmms2 client that supports rating (I like kuechenstation). I'm pretty sure there's a better way to do the grep ... | sed ... part, probably with awk, but I don't know awk, so I'd welcome any suggestions. Show Sample Output
3xmms2 mlib search NOT +rating | grep -r '^[0-9]' | sed -r 's/^([0-9]+).*/\1/' | sort -R | head | xargs -L 1 xmms2 addid -
GNU Sed can 'address' between two regex, but it continues parsing through to the end of the file. This slight alteration causes it to terminate reading the input file once the STOP match is made. In my example I have included an extra '/START/d' as my 'start' marker line contains the 'stop' string (I'm extracting data between 'resets' and using the time stamp as the 'start'). My previous coding using grep is slightly faster near the end of the file, but overall (extracting all the reset cycles in turn) the new SED method is quicker and a lot neater. Show Sample Output
3sed -n '/START/,${/STOP/q;p}' -
Find Word docs by filename in the current directory, convert each of them to plain text using antiword (taking care of spaces in filenames), then grep for a search term in the particular file. (Of course, it's better to save your data as plain text to make for easier grepping, but that's not always possible.) Requires antiword. Or you can modify it to use catdoc instead.
3find . -iname '*filename*.doc' | { while read line; do antiword "$line"; done; } | grep -C4 search_term; -
3cat /proc/net/ip_conntrack | grep ESTABLISHED | grep -c -v ^#
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I wanted all the 'hidden' .flv files from the http link in the command line; wget seemed appropriate, fed with output from lynx, grep the flv files and the normalised via sed (to remove the numeric bullet). Similar to the 'Grab mp3 files' fu. Replace link with your own, grep arg with something more interesting ;) See here for something along the same lines... http://www.commandlinefu.com/commands/view/1006/grab-mp3-files-from-your-favorite-netcasts-mp3blog-or-sites-that-often-have-good-mp3s Hope you find it useful! Improvements welcome, naturally.
3wget `lynx -dump http://www.ebow.com/ebowtube.php | grep .flv$ | sed 's/[[:blank:]]\+[[:digit:]]\+\. //g'` -
Pipe any output to "grep ." and blank lines will not be printed.
3cat filename | grep . -
-exec works better and faster then using a pipe
3find . -name "*.[ch]" -exec grep "TODO" {} + -
The grep switches eliminate the need for awk and sed. Modifying vim with -p will show all files in separate tabs, -o in separate vim windows. Just wish it didn't hose my terminal once I exit vim!!
3grep -Hrli 'foo' * | xargs vim - < 1 2 3 4 5 > Last ›
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