MAC OSX (10.11.4 El Capitan)
Calculate SHA-1 checksum:
shasum ~/Downloads/linuxmint-17.3-xfce-64bit.iso
or
shasum -a 1 ~/Downloads/linuxmint-17.3-xfce-64bit.iso
Calculate SHA-256 checksum:
shasum -a 256 ~/Downloads/linuxmint-17.3-xfce-64bit.iso
Linux (Mint 17.3 – 3.19 Kernel)
Calculate SHA-1 checksum:
shasum home/matt/Downloads/english_17.3.pdf
Calculate SHA-256 checksum:
sha256sum home/matt/Downloads/english_17.3.pdf
The BBBlog. 