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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usefull in case of abuser/DoS attacks.
special thanks to XwZ :)
Uses the PHP binary to check the syntax of all .php files in or below the current working directory. Really handy for doing that last minute check before you commit code to the repository.
Shows the current directory and those below it in a simple tree structure. Recommended use:
checking files in current and sub directories, finding out the files containing "sampleString" and removing the containing lines from the file.
* Beware that The command will update the original file [no backup].
The command can be extended if play with 'find' command together,
e.g. it is possible to execute on certain type of files: *.xml, *.txt... (find -name "*.xml" | grep....)
if anybody knows a better solution on that, please drop a comment. thx.
Format a password file for John the Ripper from Cisco configs (Level 5)
Create a tgz archive of all the files containing local changes relative to a subversion repository.
Add the '-q' option to only include files under version control:
svn st -q | cut -c 8- | sed 's/^/\"/;s/$/\"/' | xargs tar -czvf ../backup.tgz
Useful if you are not able to commit yet but want to create a quick backup of your work. Of course if you find yourself needing this it's probably a sign you should be using a branch, patches or distributed version control (git, mercurial, etc..)
Similarly, if you want to print from 10 to the end of line you can use: sed -n '10,$p' filename
This is especially useful if you are dealing with a large file. Sometimes you just want to extract a sample without opening the entire file.
Credit goes to wbx & robert at the comments section of http://www.commandlinefu.com/commands/view/348/get-line1000-from-text.#comment
The description of how the one-liner works is here at my blog:
From a saved page of google search results, split out all of the links for the results. Useful for creating apache rewrite rules from.
If the file content is :
Blah blah blah
hello blah blah blah
bloh bloh bloh
Bah bah bah
hello blah blah blah
bloh bloh bloh
If you have a file full of numbers written line by line, you can sum every line to get the total.
With a file like this:
you will got:
Replaces A with B in binary file "orig" and saves the result to "new". You must have the hex representations of A & B. Try od: echo -e "A\c" | od -An -x
Does an in situ search-replace but leaves a datestamped backup. A variation with more precision:
sed -i.`date +%Y%m%d%H%M%S 's/pattern/replace' [filename]
Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)
customizable context searches - if you know sed, this is a basis for more complex context control than grep --context offers
Function to remove a specified path from your PATH environment variable.