Commands by Treff (0)

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Look up a unicode character by name
No need for further filedes or substitution for splitting. Simply use read a b

Quickly move the cursor to different parts of the command line based on a mark.
Use 'ctrl-@' to set a mark. See the first comment for a better explanation.

Press enter and take a WebCam picture.
This command takes a 1280x1024 p picture from the webcam. If prefer it smaller, try changing the -s parameter: qqvga is the tiniest, vga is 640x480, svga is 800x600 and so on. Get your smile on and press enter! :)

Extract public key from private
This will extract the public key that is stored in the private key using openssl.

speedtest
alias speedtest='wget --output-document=/dev/null http://speedtest.wdc01.softlayer.com/downloads/test500.zip'

Trace a DNS query from root to the authoritive servers.
Simple command to trace a DNS query from the root all the way to the authoritative servers.

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"

Quick plotting of a function
The arguments of "seq" indicate the starting value, step size, and the end value of the x-range. "awk" outputs (x, f(x)) pairs and pipes them to "graph", which is part of the "plotutils" package.

Create a random password encrypted with md5 with custom lenght
This was useful to generate random passwords to some webpage users, using the sample code, inside a bash script

Merges given files line by line
In the above example all files have 4 lines. In "file1" consecutive lines are: "num, 1, 2, 3", in "file2": "name, Jack, Jim, Frank" and in "file3": "scores, 1300, 1100, 980". This one liner can save considerate ammount of time when you're trying to process serious portions of data. "-d" option allows one to set series of characters to be used as separators between data originating from given files.


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