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To colourize the diff output on the command line, you may use:

diff file-1.txt file-2.txt | colordiff
// Or:
colordiff file-1.txt file-2.txt

Also, to see changed lines in one colour, and unchanged lines in another colour, consider something like:

diff --old-group-format=$'\e[0;31m%<\e[0m'  --new-group-format=$'\e[0;31m%>\e[0m' --unchanged-group-format=$'\e[0;32m%=\e[0m'  file-1.txt file-2.txt

Gentoo package: