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Find out current working directory of a process

Multiple variable assignments from command output in BASH
No command substitution but subshell redirection

Get all mac address

Trace and view network traffic
Trace and view network traffic. I made this far too complicated.. now fixed, thanks zolden.

Read a tcpdump file and count SYN packets to port 80, Order column by destination.

Extracting frames from a video as jpeg files
This command extracts 10 seconds worth of frames, starting from 00:15:45 position, from filename.avi and stores them into out_frames folder as jpeg files. Subtitles are turned off with -sid 999 option.

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.

LIST FILENAMES OF FILES CREATED TODAY IN CURRENT DIRECTORY
Then pipe to 'xargs ls' for a familiar listing, possibly using find's -print0 and xarg's -0 options.

Git diff last two commits
How about this one ?

umount --rbind mount with submounts
Original: https://bugzilla.redhat.com/show_bug.cgi?id=194342


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