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Change prompt to MS-DOS one (joke)
This one eliminates the additional backslash at the end (which is not necessary)

Prints line numbers
If you don't have nl on your system, this achieves a similar effect, the default behavior in nl is to not number blank lines, but this does.

Randomly run command
Randomly decide whether to run a command, or fail. It's useful for testing purposes. . Usage: ran PERCENTAGE COMMAND [ARGS] Note: In this version the percentage is required. . This is like @sesom42 and @snipertyler's commands but in a USABLE form. . e.g. In your complicated shell script, put "ran 99" before a crucial component. Now, it will fail 1% of the time allowing you to test the failure code-path. $ ran 99 my_complex_program arg1 arg2

Synchronize date and time with a server over ssh
using -u is better for standardizing date output and timezones, for servers in different timezones.

find established tcp connections without using netstat!!
Fast and easy way to find all established tcp connections without using the netstat command.

Start a local web server in the current directory on a random dynamic port.

Get your internal IP address and nothing but your internal IP address
Will return your internal IP address.

Update twitter via curl
Doesn't require password (asks for it instead)

check open ports without netstat or lsof

Rename files in batch


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