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Mouse Tracking
Will track your mouse and save it to a file. You can use gnuplot to graph it: $ gnuplot -persist

Create arbitrary big file full of zeroes but done in a second
If you want to create fast a very big file for testing purposes and you do not care about its content, then you can use this command to create a file of arbitrary size within less than a second. Content of file will be all zero bytes. The trick is that the content is just not written to the disk, instead the space for it is somehow reserved on operating system level and file system level. It would be filled when first accessed/written (not sure about the mechanism that lies below, but it makes the file creation super fast). Instead of '1G' as in the example, you could use other modifiers like 200K for kilobytes (1024 bytes), 500M for megabytes (1024 * 1024 bytes), 20G for Gigabytes (1024*1024*1024 bytes), 30T for Terabytes (1024^4 bytes). Also P for Penta, etc... Command tested under Linux.

Run the Firefox Profile Manager
even when another instance is already open. Great for testing purposes when you need to be 2 people at once on the same site.

fdiff is a 'filtered diff'. Given a text filter and two inputs, will run the filter across the input files and diff the output.
Fdiff will run the command given by the first argument against the input files given as the second and third arguments, and diff the results. It will use 'diff' as the default diff program, but this can be changed by setting $DIFFCMD, e.g. $ export DIFFCMD=vimdiff; $ fdiff zcat 0716_0020005.raw.gz 0716_0030005.raw.gz ... This function will work under bash, but requires the use of command substitution, which is not available under a strict ANSI shell.

Reuse last parameter
Reuse the last parameter of the previous command line

List dot-files and dirs, but not . or ..

check open ports without netstat or lsof

Kill google chrome process

escape any command aliases
e.g. if rm is aliased for 'rm -i', you can escape the alias by prepending a backslash: rm [file] # WILL prompt for confirmation per the alias \rm [file] # will NOT prompt for confirmation per the default behavior of the command

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"


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