To use lesspipe.sh, type in the following commands

LESSOPEN="|%%PREFIX%%/bin/lesspipe.sh %s"; export LESSOPEN (sh, bash, ksh, zsh)

setenv LESSOPEN "|%%PREFIX%%/bin/lesspipe.sh %s"           (csh, tcsh)

or put these commands in your shell's startup file (e.g. .cshrc or .bashrc).