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Share your terminal session (remotely or whatever)
Force the user you want to watch doing things into doing his things in a screen session. Then simply attach yourself to that session with the command shown above. Works only if you are on the same machine, of course

Remove multiple same rpm packages
If somehow if you get more than 1 same name rpm package install, then it cannot be removed by using simple rpm -e as it gives you more than one rpm matches error. The --matches will help to remove all the same name rpm packages.

Clone /
Clone linux installation.

Ping all hosts on 192.168.1.0/24
Will report back IP address's of all hosts that are UP.

Disconnect telnet
You are stuck with testing a tcp port using telnet, and must kill the telnet session from another terminal... Or, press ctrl+5 and write close/quit to force the current connection to close..

list all file extensions in a directory
If your grep doesn't have an -o option, you can use sed instead.

Copy history from one terminal to another
Or just do history -w before opening another terminal.

Count number of Line for all the files in a directory recursively

FizzBuzz one-liner in Python
A common programming question for interviewers to ask potential job candidates is to code "FizzBuzz". That is, if a number is divisible by 3, then it should display "Fizz". If a number is divisible by 5, it should display "Buzz". If it is divisible by both, then it should display "FizzBuzz". Otherwise, display the current number between 1 and 100.

Print a list of standard error codes and descriptions.
Written by jmcnamara Taken from http://www.perlmonks.org/?node_id=274896


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