commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/
You can sign-in using OpenID credentials, or register a traditional username and password.
First-time OpenID users will be automatically assigned a username which can be changed after signing in.
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,…):
Subscribe to the feed for:
Bash scrip to test if a server is up, you can use this before wget'ing a file to make sure a blank one isn't downloaded.
I wanted to play a song from the shell and get the shell back, I also dont want to store the file if it is not needed.
edit, not sure if I need to mention it... killall vlc to stop it
compare to alternative :
- directly tests the -STOP of the process to continue or stop loop,
- background operator should be set (or not) at the call of the function
For extension i suggest a slowPID() based on kill like above and a slowCMD based on killall.
On my music directory, I create variable that contains all mp3s files, then I play them with mpg123. -C options enable terminal control key, s for stop, p for pause, f for forward to next song.
Remove all empty directories below the current directory. If directories become empty as the results of this, remove those too.
Get just the IP address for a given hostname. For best results, make this a function in your shell rc file so that it can be used for things like traceroute:
Titus:~$ traceroute `getip foo.com`
traceroute to 22.214.171.124 (126.96.36.199), 64 hops max, 52 byte packets
This is a quick and dirty way of creating key/value pairs in bash. Not as flexible as an associative array, but often powerful enough to be useful. For example, if I want to rename sets of files in a way that I can't do with wildcards, I'll create something like 'rename-me.txt'
Then I'll traverse rename-me.txt with a read loop
cat rename-me.txt | while read line;
mv $old $new;
Have wc work on each file then add up the total with awk; get a 43% speed increase on RHEL over using "-exec cat|wc -l" and a 67% increase on my Ubuntu laptop (this is with 10MB of data in 767 files).
By default, slot 1 is used for OTP purposes and validates against the Yubikey servers. Running the command above will replace that. If you have a Yubikey 2 or above, you can change -1 to -2 and program the second slot with a strong static key.
take a list of IP:PORT and output IP:PORT:COUNTRY
Traffic details on the Ethernet interface.
When you press "cmd+n" in TextMate, you can have "HTML" language as default document format... You can also define other languages too. You need to know the UUID of your language bundle.
1.) my profile ends with $USER not with .default
2.) only grep for the first occurrence because some extensions have the translated name also inside the install.rdf
This is an easy way to quickly get a status for a device in multipath on SLES systems, as long as the server is configured based on Novell's standards, where multipathed disks are referred to by /dev/disk/by-... tree. Make sure to replace name_of_vg with your Volume Group name.
You want bash to keep running the command until it is successful (until the exit code is 0). Give a dummy command, which sets the exit code to 1 then keep running your command until it exits cleanly
Instead of dumping the entire query to the screen, it will use 'less -S' to handle pagination. This means you can move back and forward through the result set, and instead of wrapping rows at screen boundaries, the table will extend off the screen, and can be scrolled left and right with arrow keys.
1. Get name of task by task=$(basename "$(pwd)")
2. Check whether "$task.c" exists as a file
3. open "$task.c", "$task.in", "task.out" in vim with such layout.
| | $task.in |
| | |
| | $task.out |
| | |
This is a bit hacky, but if you're setting up a bunch of new LUNs, it can save a bunch of time. Also check out sfdisk. The fdisk will fail if, for example, a partition table already exists.
* Make a FIFO file named replypipe
* listen on 1234
* pass the request to unix socket
* unix socket will reply to replypipe
* replypipe will write reply to the client
From a saved page of google search results, split out all of the links for the results. Useful for creating apache rewrite rules from.