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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"

Show a prettified list of nearby wireless APs

Optimize Xsane PDFs
Xsane produces PDFs that are too large - particularly multipage PDFs. This command compresses them. If you do not use A4, remove the -sPAPERSIZE flag.

Update pandoc via cabal
An alternative to built-in package manager, keep pandoc in sync with upstream releases.

Length of longest line of code
Here's an awk version.

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.

Install pip with Proxy
Installs pip packages defining a proxy

Btrfs: Find file names with checksum errors
Btrfs reports the inode numbers of files with failed checksums. Use `find` to lookup the file names of those inodes. The files may need to be deleted and replaced with backups.

Display GCC Predefined Macros
doesn't need /dev/null

Get the number of days in a given month and year


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