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Linux / Unix: Generate A MD5 String

I need to generate a md5 hash for given string. It will be used by shell script to generate keys for remote web service or cryptographic application. How do I generate a md5 hash based on any input string under Linux or Unix like operating systems?
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CentOS / RHEL: Install gpass Password Manager For GNOME2 Desktop

I‘ve recently swiched from Ubuntu Linux to CentOS / RHEL / Scientific Linux version 6 gnome desktop. However, I’m unable to find the gpass the password manager for GNOME2 desktop in repo. How do I install the same under RHEL 6 or CentOS or Scientific Linux 6 or Fedora Linux 15?
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Install / Append SSH Key In A Remote Linux / UNIX Servers Authorized_keys

How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?
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UNIX / Linux: PGP TarBall File Signature Keys Verification

I‘ve downloaded open source software from the Internet. The download server also provided me the PGP signature file. How do I verify that signature (file.tar.gz.asc) file against downloaded software release (software.version.tar.gz) under Linux / UNIX operating systems?
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Linux / UNIX: Generate SSH Keys

How do I generate ssh keys under Linux / UNIX / Mac OS X and *BSD operating systems for remote login?
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