SHA碼
linux系統預設有許多產生SHA碼的指令，這些指令對應到不同的長度編碼，可依自己的需求使用
# ls /usr/bin/sha*
/usr/bin/sha1hmac /usr/bin/sha224sum /usr/bin/sha256sum /usr/bin/sha384sum /usr/bin/sha512sum
/usr/bin/sha1sum /usr/bin/sha256hmac /usr/bin/sha384hmac /usr/bin/sha512hmac

shell> echo password | sha256sum
6b3a55e0261b0304143f805a24924d0c1c44524821305f31d9277843b8a10f4e –

MD5碼
shell> echo password | md5sum
286755fad04869ca523320acce0dc6a4 –

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