Just run echo -n any string | shasum -a 256 | awk '{ print $1 }'

Fin.

Note

• AWK are not acronym of awkward but it's acronym of the family names of its authors (Alfred Aho, Peter Weinberger, and Brian Kernighan)
• Added -n to echo to prevent new line so that we will get the right SHA256 from our input string without newline 😺 (suggestion from @fallenpixel)