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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Oneliner to get domain names list of all existing domain names (from wikipedia)
Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.
Let's you examine, for example, whether infrastructure folks really provisioned the correct setup.
Java 64-bit checklist
1. check if hardware is 64-bit capable by looking for lm flag
grep -l 'flags.*\<lm\>' /proc/cpuinfo
2. check if kernel is 64-bit
getconf LONG_BIT | grep '64'
3. check if java is 64-bit (simply look for 64-bit in output - if present, then it is, if absent, then it is 32-bit)
Trick to avoid the form:
grep process | grep - v grep
Place in .bash_profile
A lot of files in one dir is not so cool for filesystem.
This command downloads the actual 20 most popular pictures from the website 500px. It uses a random name due to the fact the the pictures in 500px are stored with the same name.
UPDATED: doesn't work if no referrer is specified: --referer='http://500px.com/'
Returns the IP, broadcast, and subnet mask of your interfaces absent any other extraneous info.
I know it's a bit lame, but I've created an alias for this when I *quickly* want to know what a system's IP is. Small amounts of time add up :)
get the ip address on your LAN
get the ip address on your LAN
command for conky. To update a random command for each 300 sec from commandline.com
Old Sys5 system and SUN computers don't have the -H option. Adding /dev/null forces grep to use the multi-file output and report the file name.
Take a screenshot, give $1 seconds pause to choose what to screenshot, then upload and get URI of post in ompdlr.org
Create a .png from output command or whatever, the upload and give URI from ompdlr.org
Useful for figuring out which services are lagging the boot time on the system.