commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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url can be a working copy or url to a svn repository, revision is any valid revision number for that branch.
Quick and dirty command that counts how many words can be typed just using the home row on the Dvorak Simplified Keyboard layout from a dictionary file, in this case /usr/share/dict/words.
According to the regular expression supplied, each word must contain all the keys on the Dvorak home row, and no other characters. For comparison, I've shown how many words are installed in my dictionary, how many can be typed with just the Dvorak home row and how many can be typed with just the QWERTY home row in the sample output. Nearly 10 times the amount.
If you want to see the words, remove the -c switch, and each word will be printed out.
Get the svn info, grep for the "URL" of the repository, pull out the tag/branch/trunk, and then just show the helpful/meaningful bit.
This is useful for piping to other commands, as well:
svn status | egrep '^(M|A)' | egrep -o '[^MA\ ].*$' | xargs $EDITOR
If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.
Will search recursively and output the searchResult.txt in the same folder you are located.
Ran as the postgres user, dumps each database individually. It dumps with the create statements as well, so you can just 'zcat $x-nightly.dmp.gz | psql' to reimport/recreate a database from a backup.
search file for string1 or string2
Want to know why your load average is so high? Run this command to see what processes are on the run queue. Runnable processes have a status of "R", and commands waiting on I/O have a status of "D".
On some older versions of Linux may require -emo instead of -eo.
On Solaris: ps -aefL -o s -o user -o comm | egrep "^O|^R|COMMAND"
Yet another ps grep function, but this one includes the column headings.
This command would be useful when it is desirable to list only the directories. 'egrep' chooses only the lines that begin with 'd'.
Greps IRC logs for phrases and lists users who said them.