cksum - checksum and count the bytes in a file.
cksum command in Linux is used to display a cyclic redundancy check (CRC) value. CRC is unique for each file and only changes if the file is edited
$ cksum package.json
after transfer of package.json to other device or location, we can confirm with with cksum
$ cksum package.json
CRC value is same hence the file is not corrupted or edited