Commands by commandlinefu (5)

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

Creates PodFeeds.txt, a file that lists the URLs of rhythmbox podcasts from the rhythmdb.xml file.
The first grep any line with pod-feed in it plus the following five lines. The second grep throws out any line not containing . sed removes the leading four spaces then and the trailing . Using a colon as sed's separating character avoids having to escape the /. Works ok with Mythbuntu 9.04 (used mostly as a three line bash script).

Use a decoy while scanning ports to avoid getting caught by the sys admin :9
Scan for open ports on the target device/computer (192.168.0.10) while setting up a decoy address (192.168.0.2). This will show the decoy ip address instead of your ip in targets security logs. Decoy address needs to be alive. Check the targets security log at /var/log/secure to make sure it worked.

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Changes standard mysql client output to 'less'.
Changes standard mysql client output to 'less'. In another words makes query results of mysql command line client to look much better.

Output sound when your computer is downloading something
Outputs pseudo-random sounds to speakers (stereo mode because of -c 2) when there are any kind of network activity.

Rename files in batch

connect via ssh using mac address
Instead of looking for the right ip address, just pick whatever address you like and set a static ip mapping.

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

Count threads of a jvm process
if you have problem threads problem in tomcat


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