How to check crc of a file?

$ sudo apt-get install libarchive-zip-perl
$ crc32 my_file

One way to calculate it is this:

cksum "file"

Another one is

crc32 "file"

To use this last command you need to install libarchive-zip-perl package

I'd use the internal md5sum one of the provided sha programs:

sha1sum (1)          - compute and check SHA1 message digest
sha224sum (1)        - compute and check SHA224 message digest
sha256sum (1)        - compute and check SHA256 message digest
sha384sum (1)        - compute and check SHA384 message digest
sha512sum (1)        - compute and check SHA512 message digest

cksum is pretty much outmoded these days because of its problems.

cksfv app from cksfv package generates CRC32 checksum as well.

You can try to use rhash.

• http://rhash.sourceforge.net/
• https://github.com/rhash/RHash
• http://manpages.ubuntu.com/manpages/bionic/man1/rhash.1.html

Test:

$ sudo apt-get install rhash
$ echo -n 123456789 | rhash --simple -
cbf43926  (stdin)

you can accomplish this with a very simple perl script. use String::CRC32;

my $s = <STDIN>;

my $crc = crc32($s);
printf "%08x\n", $crc;