Generating a SHA-256 hash from the Linux command line

Question

I know the string  foobar  generates the SHA-256 hash c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2 using http   hash online-convert com sha256-generator  However the command line shell   hendry x201    echo foobar   sha256sum aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f  -   Generates a different hash  What am I missing

User · Answer

If you have installed openssl  you can use   echo -n  foobar    openssl dgst -sha256   For other algorithms you can replace -sha256 with -md4  -md5  -ripemd160  -sha  -sha1  -sha224  -sha384  -sha512 or -whirlpool

User · Answer

I believe that echo outputs a trailing newline  Try using -n as a parameter to echo to skip the newline

User · Answer

If the command sha256sum is not available  on Mac nbsp OS nbsp X v10 9  Mavericks  for example   you can use   echo -n  foobar    shasum -a 256

User · Answer

echo -n works and is unlikely to ever disappear due to massive historical usage  however per recent versions of the POSIX standard  new conforming applications are  encouraged to use printf

User · Answer

For the sha256 hash in base64  use  echo -n foo   openssl dgst -binary -sha1   openssl base64  Example echo -n foo   openssl dgst -binary -sha1   openssl base64 C 7Hteo D9vJXQ3UfzxbwnXaijM

User · Answer

echo produces a trailing newline character which is hashed too  Try    bin echo -n foobar   sha256sum

User · Answer

echo will normally output a newline  which is suppressed with -n  Try this   echo -n foobar   sha256sum

[linux] Generating a SHA-256 hash from the Linux command line

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