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:
Print a git log (in reverse order) giving a reference relative to HEAD.
HEAD (the current revision) can also be referred to as HEAD~0
The previous revision is HEAD~1 then HEAD~2 etc.
Add line numbers to the git output, starting at zero:
... | nl -v0 | ...
Insert the string 'HEAD~' before the number using sed:
... | sed 's/^ \+/&HEAD~/'
Thanks to bartonski for the idea :-)
I copied this (let's be honest) somewhere on internet and I just made it as a function ready to be used as alias. It shows the 10 most used commands from history. This seems to be just another "most used commands from history", but hey.. this is a function!!! :D
perhaps you should use CMD[$2] instead of CMD[$4]
This command print the last line of a file with in first position the total lines number.
Interesting to see which packages are larger than the kernel package.
Useful to understand which RPMs might be candidates to remove if drive space is restricted.
"nl -ba" numbers all lines in the file (including empty lines), "sort -nr"
sorts the lines in descending order, and the "cut" command finally removes
the line numbers again.
usage: dng BRE [selection]
default selection is the last match
DNS is ok, but although domainnames may be easier to remember than IP numbers, it still requires typing them out. This can be error-prone. Even more so than typing IPv4 numbers, depending on the domainname, its length and complexity.
Add permanent line numbers to a file without creating a temp file.
The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10.
The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.
This function is used to sort selected lines of a text file to the end of that file. Especially useful in cases where human intervention is necessary to sort out parts of a file. Let's say that you have a text file which contains the words
For whatever reason, you want to sort all words rhyming with 'tough' to the bottom of the file, and all words denoting colors to the top, while keeping the order of the rest of the file intact.
'$EDITOR' will open, showing all of the lines in the given file, numbered with '0' padding. Adding a '~' to the beginning of the line will cause the line to sort to the end of the file, adding '!' will cause it to sort to the beginning.
Works in RHEL5 and derivatives.
Not as far off as you thought, now is it?
Next time you see a mac fanboy bragging about 64-bitness of 10.6 give him this so he might sh?
The nl command lists the contents of a file where is each line is prefixed by a line number. For more information about this command, check out its man page. I tested under Mac OS X and Xubuntu 9.04
Low on disk space? Check the largest installed RPMs for delete canditates.