Done pdir /(k) for the output of the @CKSUM function.

[mfarah]

Currently pdir /(m r) can output a file's MD5 and CRC32 hash values as if calling, respectively, @MD5 and @CRC32; perhaps the 'k' character could do the same thing for the @cksum function.

The only caveat is that, unlike the other two functions, @cksum's output isn't always of the same length. If adopted, /(k) should display its numeric output padded to the left with spaces to fill 10 characters.