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Emptying a text file in one shot
% = buffer d = delete

Validate date, also a date within a leap year
Important to know: a valid date will return 0, otherwise 1!

let the cow suggest some commit messages for you

Compare two CSV files, discarding any repeated lines
The value for the sort command's -k argument is the column in the CSV file to sort on. In this example, it sorts on the second column. You must use some form of the sort command in order for uniq to work properly.

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"

Forwards connections to your port 2000 to the port 22 of a remote host via ssh tunnel

remove recursively all txt files with number of lines less than 10

Find directory depth
Returns a the directory depth.

Merge bash terminal histories

send a circular


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