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SMS reminder
Send an e-mail to SMS reminder in 15 minutes from now, to call my wife. See list of carriers bellow Carrier Email to SMS Gateway Alltel [10-digit phone number]@message.alltel.com AT&T (formerly Cingular) [10-digit phone number]@txt.att.net [10-digit phone number]@mms.att.net (MMS) [10-digit phone number]@cingularme.com Boost Mobile [10-digit phone number]@myboostmobile.com Nextel (now Sprint Nextel) [10-digit telephone number]@messaging.nextel.com Sprint PCS (now Sprint Nextel) [10-digit phone number]@messaging.sprintpcs.com [10-digit phone number]@pm.sprint.com (MMS) T-Mobile [10-digit phone number]@tmomail.net US Cellular [10-digit phone number]email.uscc.net (SMS) [10-digit phone number]@mms.uscc.net (MMS) Verizon [10-digit phone number]@vtext.com [10-digit phone number]@vzwpix.com (MMS) Virgin Mobile USA [10-digit phone number]@vmobl.com

what model of computer I'm using?

'hpc' in the box - starts a maximum of n compute commands modulo n controlled in parallel
the block of the loop is useful whenever you have huge junks of similar jobs, e.g., convert high res images to thumbnails, and make usage out of all the SMP power on your compute box without flooding the system. note: c is used as counter and the random sleep $ r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r is just used as a dummy command.

extract element of xml

remove files and directories with acces time older than a given date
touch a dummy file with the specified date, then use find with -anewer .

scp with compression.
-C is for compression.

Calculate days on which Friday the 13th occurs
Simply change the years listed in the first seq, and it will print out all the months in that span of years that have Friday the 13ths in them.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Uptime in minute
Want to run scripts/programs in the system after starting X minute [ For letting the system to free ]? This will give uptime in minute.

Analyze, check, auto-repair and optimize Mysql Database
A useful way to do a full check and auto repair damaged databases


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