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commandlinefu.com is the place to record those command-line gems that you return to again and again. 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.

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Copy a directory recursively without data/files

Find and list users who talk like "lolcats"
Greps IRC logs for phrases and lists users who said them.

Automatically find and re-attach to a detached screen session
-RR option is used to resume the first appropriate detached screen session

Open multiple tabs in Firefox from a file containing urls
this will open a new tab in firefox for every line in a file the sleep is removable but i found that if you have a large list of urls 50+, and no sleep, it will try to open all the urls at once and this will cause them all to load a lot slower, also depending on the ram of your system sleep gives you a chance to close the tabs before they overload your ram, removing & >2/dev/null will yield unpredictable results.

Calculate N!
Same as the seq/bc solution but without bc.

output length of longest line

Convert files from DOS line endings to UNIX line endings
This method will also convert mac line endings.

view all lines without comments.

Maximum PNG compression with optipng, advpng, and advdef
optipng and advancecomp (for the the advpng and advdef tools) are the best FOSS tools for losslessly compressing PNGs. With the above tool chain, you can cut off as much as 20% off a PNG's file size.

check open ports without netstat or lsof


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