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# General file operations and utilities
## `ls`
* `-S`: sort by file size (largest first)
* `-r`: reverse sorting order
## `shred`
Overwrites a file repeatedly with random data, to prevent data recovery.
* `-z`: zeroes out at the end
* `-n <N>`: does `N` iterations (deafults to only 3)
* `-u`: deallocates and removes file
So a common usage:
shred -zun100 <file>
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