CODEWITHSUNDEEP
bash
user3613290
user3613290

Reputation: 481

Bash command to truncate bytes off end of file

I have a file that will always have a fixed 16 byte garbage set of characters appended to the end.

I want to run a bash command to remove those last 16 bytes. I found truncate, but a command such as truncate -s 16 myfile.json will truncate myfile.json entire file size to 16 bytes which isn't what I want. Is there a command for truncating bytes off the end of a file?

Upvotes: 3

Views: 1866

Answers (1)

that other guy
that other guy

Reputation: 123460

When a command does something very close to what you want, it's always worth checking the man page:

SIZE may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round down to multiple of, '%' round up to multiple of.

So:

truncate -s -16 myfile.json

Upvotes: 9

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