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.
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
Use the command line to log into Dropbox. You have to replace [email protected] with your Dropbox email (note the URL-encoding of "@" as %40). Also replace my_passwd with your Dropbox password. (Note: special characters in your password (such as #) must be url-encoded. You will get a cookie (stored in file "cookie") that you can use for subsequent curl operations to dropbox, for example curl -b cookie https://www.dropbox.com/home. Debug note: If you want to see what data curl posts, use curl's --trace-ascii flag.
Batch resize all images to a width of 'X' pixels while maintaing the aspect ratio.
This makes uses of ImageMagick to make life easier.
It starts in the current working directory.
It removes the empty directory and its ancestors (unless the ancestor contains other elements than the empty directory itself).
It will print a failure message for every directory that isn't empty.
This command handles correctly directory names containing single or double quotes, spaces or newlines.
If you do not want only to remove all the ancestors, just use:
find . -empty -type d -print0 | xargs -0 rmdir
This command removes and then cvs removes all files in the current directory recursively.
use it to add a random boolean switch to your script
use it to stagger cronjob or to get a random number
increase the range by replacing 100 with your own max value
I don't like doing a massive sort on all the directory names just to get a small set of them. the above shows a sorted list of all directories over 1GB. use head as well if you want.
du's "-x" flag limits this to one file system. That's mostly useful when you run it on "/" but don't want "/proc" and "/dev" and so forth. Remember though that it will also exclude "/home" or "/var" if those are separate partitions.
the "-a" option is often useful too, for listing large files as well as large directories. Might be slower.
list the top 15 folders by decreasing size in MB
This commands queries the delicious api then runs the xml through xml2, grabs the urls cuts out the first two columns, passes through uniq to remove duplicates if any, and then goes into linkchecker who checks the links. the links go the blacklist in ~/.linkchecker/blacklist. please see the manual pages for further info peeps. I took me a few days to figure this one out. I how you enjoy it. Also don't run these api more then once a few seconds you can get banned by delicious see their site for info. ~updated for no recursive
POSIX compliant arithmetic evaluation.
echo 'alias monitor_off="sleep 1; xset dpms force standby"' >> ~/.bash_aliases ; . ~/.bash_aliases # now monitor_off does what you think
This keeps the user logged in but shows the login screen. Very useful when connecting remotely to an OSX-Server via VNC
This allows you to search through your history using the up and down arrows ? i.e. type "cd /" and press the up arrow and you'll search through everything in your history that starts with "cd /".
Only requirement is bash shell. No functions needed.
this bash command sets it so that when you type "screen ", it searches your running screens, and present valid auto-complete choices. The output is .
Note: You must have programmable completion enabled. Check with "shopt progcomp", set with "shopt -s progcomp"
This exports all lines of input file as environment variables, assuming each line is like these:
echo "ls" > script.bash;
This is my script, a simple 'ls'.
gpg -c script.bash;
Here I encrypt and passord-protect my script. This creates file script.bash.gpg.
cat script.bash.gpg | gpg -d --no-mdc-warning | bash
Here I open file script.bash.gpg, decrypt it and execute it.
The original command doesn't work for me - does something weird with sed (-r) and xargs (-i) with underscores all over...
This one works in OSX Lion. I haven't tested it anywhere else, but if you have bash, gpg and perl, it should work.
just an alternative to setting the size, this allows you to scroll up and see your previous commands in a given session but when you logout the history is not saved. That's the only advantage to doing it this way..