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a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Display top 5 processes consuming CPU

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"

Merge files, joining each line in one line

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Convert multiple pdf's to jpg in linux using the convert command

Git Global search and replace
Find all the occurrences in the git repo of 'foo' and replace with 'bar'

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Edit a PDF's metadata using exiftool
Edit the pdf file foo.pdf's metadata. -overwrite_original overwrites the original file (w/o it exiftool creates a new file)

Install pip with Proxy
Installs pip packages defining a proxy


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