cheat-fork-echo/cheat/cheatsheets/shred

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# To shred a file (5 passes) and verbose output:
shred -n 5 -v file.txt
# To shred a file (5 passes) and a final overwrite of zeroes:
shred -n 5 -vz file.txt
# To do the above, and then truncate and rm the file:
shred -n 5 -vzu file.txt
# To shred a partition:
shred -n 5 -vz /dev/sda
# Remember that shred may not behave as expected on journaled file systems if file data is being journaled.