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.
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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,…):
Subscribe to the feed for:
In case you need to test some CGI scripts this does the job. It also has the functionality of a http server.
Show the maximum amount of memory that was needed by a process at any time. My use case: Having a long-running computation job on $BIG_COMPUTER and judging whether it will also run on $SMALL_COMPUTER.
VmHWM: Peak resident set size ("high water mark")
only during session
List all fonts used by an SVG file. Useful to find out which fonts you need to have installed in order to open/edit an SVG file appropriately.
With sed you can replace strings on the fly.
Command returns valid IP addresses. Append the following regex to additionally filter out NAT and reserved IP addresses
| grep -Ev "^0|\.0[0-9]|^10\.|^127\.|^169\.|^172\.(1[6-9]|2[0-9]|3)|^192.168.|^2(2[4-9]|3[0-9])|^2(4[0-9]|5[0-5])"
not shown ifconfig error
jhead is required
imagemagick is required
backup your files in tar archive + timestamp of backup
The internet is full of advice about how to change the caps lock key into a backspace key (a useful practice that originated with Colemak), but a lot of instructions are complicated or outdated.
After *lots* of searching for something that still worked on Ubuntu 14.04, I finally found that this simple command is sufficient and takes effect immediately.