cksum Built-Ins
The built-ins calculate the checksum of a file or path instance and output it as a string. They produce errors on directories.
${file?crc} creates the CRC hash of a file.
${path?crc32} creates the CRCR32 hash of a file.
${file?md5} creates the MD5 hash of a file.
${path?sha1} creates the SHA1 hash of a file.
Edited by Jens Kaiser