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Check ps output to see if file is running, if not start it
This comes in handy if you have daemons/programs that have potential issues and stop/disappear, etc., can be run in cron to ensure that a program remains up no matter what. Be advised though, if a program did core out, you'd likely want to know why (gdb) so use with caution on production machines.

Google URL shortener
Use curl and sed to shorten an URL using goo.gl without any other api

CLFUContest : Check which process consume more than 10% of the cpu (configurable)

print line and execute it in BASH
!# is the currennt line so far, by using !#:- you can go from the second arg (it's zero indexed) to the last ($) (did I understand the problem correctly?)

Generate hash( of some types) from string
No need to install yet another program when openssl is already installed. :-)

Change the default editor for modifying the sudoers list.
On Ubuntu, the default editor for visudo is nano. To change the editor to something else (e.g., vi) use this command.

Determine whether a CPU has 64 bit capability or not
Check if you have 64bit by looking for "lm" in cpuinfo. lm stands for "long mem". This can also be used without being root.

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"

replace a character/word/string in a file using vim
Replace all ocurrences in the file. The g option is to replace more than one occurrence in the same line. Whitout the g option, it only replace the first occurrence in the line.

Search some text from all files inside a directory


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