Read the source code and the comments to understand what this does. #!/bin/bash # — # this will write 0s across a drive at random locations (using dd) # you specify theRead More…

Zcat and zgrep UPDATE 2016-04-26: thanks for article here http://unix.stackexchange.com/questions/77296/is-there-a-tool-that-combines-zcat-and-cat-transparently Forget my lcat function, just use the already provided zgrep and zcat commands. FORMAT: zcat -f — * # reads all files (normal andRead More…

Bulk Terminal Rename for many files and folders. SIDENOTE: This is a common rename tool. Commonly I see it called as simply “rename”. In cygwin its called “prename” (other distros also call itRead More…

BTRFS – TOO MANY BALANCES – When to do balances ############################################# We (who is we, btrfs users) shouldn’t do em as much. They dont do much unless the systems allocation is full.Read More…

If you installed a program (with apt, yum, or compiled it and then installed – or whatever) and then you try to run it. # gem but you get the error (evenRead More…

USE AT YOUR OWN RISK – HAVE A BACKUP PRIOR TO RUNNING Sometimes you dont want COW, because COW is copy on write and causes fragmentation where there are alot of readsRead More…

Intro Researching what is vmcom and vmlim from atop output, led me to research more interesting info on RAM and I learned alot. I want to include the interesting excerpts that IRead More…