Commands by takeshin (7)

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list block devices
Shows all block devices in a tree with descruptions of what they are.

run command on a group of nodes in parallel
Parallel is from https://savannah.nongnu.org/projects/parallel/ Other examples would be: (echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

See entire packet payload using tcpdump.
This command will show you the entire payload of a packet. The final "s" increases the snaplength, grabbing the whole packet.

See your current RAM frequency

back ssh from firewalled hosts
host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

Solaris get PID socket
Command line to get which PID is opening a socket on IP and PORT. Only useful under Solaris.

find all file larger than 500M
Greater than 500M and sorted by size.

recursive search and replace old with new string, inside files
If you can install rpl it's simpler to use and faster than combinations of find, grep and sed. See man rpl for various options. time on above operation: real 0m0.862s, user 0m0.548s, sys 0m0.180s using find + sed: real 0m3.546s, user 0m1.752s, sys 0m1.580s

Clean apt-get and gpg cache and keys
Cleans apt-get and gpg cache and keys

Update all ant packages installed in gentoo
Update all "ant" packages installed on Gentoo


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