echo -n "foo" | openssl dgst -sha1

(stdin)= 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33

echo -n "foo" | openssl dgst -sha1 | sed 's/^.* //'

echo -n "foo" | sha1sum | sed 's/ .*//'

echo -n "foo" | sha1 -q

digest=$(echo -n "foo" | openssl dgst -sha1 | sed 's/^.* //')

echo -n "foo" | openssl dgst -sha1 | sed 's/^.* //' | tr -d 'n' | unusual_program

echo -n "foo" | openssl dgst -sha1 -binary | xxd -p

0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33

echo -n "foo" | openssl sha1 | awk '{print $2}'

output="$(openssl sha1 <(printf foo))"; echo ${output/* }