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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"

Hiding password while reading it from keyboard
Allow to read password in a script without showing the password inserted by the user

Get My Public IP Address

List out classes in of all htmls in directory
Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

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"

mail with attachment
An easy one but nice to keep in mind.

Shuffle mp3 files in current folder and play them.
* grep -i leaves only mp3 files (case insentitive) * sort -R randomizes list (may use GNU 'shuf' instead). * the sed command will add double quotes around each filename (needed if odd characters are present)

Indent all the files in a project using emacs
use -iname \*[.ch] instead of -iname \*.c -o -iname \*.h

Format date/time string for a different day
The "date' command has options to easily format the date, day, month, time, etc. But what if you want a relative date or time. Like, I wanted yesterday's date in a particular format. You may want the exact date of "2 months ago" or "-3 days" nicely formatted. For that, you can use this command. The --date option takes fuzzy parameters like the ones mentioned in the previous sentence.

list all opened ports on host
in loop, until the last port (65535), list all opened ports on host. in the sample I used localhost, but you can replace with any host to test.


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