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Figure out what shell you're running
short, sweet, and works after sudoing a new shell.

Determining the excat memory usages by certain PID
this command gives you the total number of memory usuage and open files by the perticuler PID.

Undo commit in Mercurial

Scan a gz file for non-printable characters and display each line number and line that contains them.
Scans the file once to build a list of line numbers that contain non-printable characters Scans the file again, passing those line numbers to sed as two commands to print the line number and the line itself. Also passes the output through a tr to replace the characters with a ?

Find biggest 10 files in current and subdirectories and sort by file size

Get video information with ffmpeg
ffprobe is specially intended to get video information

run command on a group of nodes in parallel
Parallel is from https://savannah.nongnu.org/projects/parallel/ Other examples would be: (echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

Rename files in batch

How To Get the Apache Document Root
Grabs the Apache config file (yielded from httpd) and returns the path specified as DocumentRoot.

Download free e-books
Mask the user agent as firefox, recursively download 2 levels deep from a span host with a maximum of 1 redirection, use random wait time and dump all pdf files to myBooksFolder without creating any other directories. Host will have no way of knowing that this is a grabber script.


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