s/\~\//\$HOME\//g - There's possibly a nicer way to make sure tilde expansion is done in the right places, but this works just as well and doesn't require extra thinking when I'm half asleep :P Added (^|:) to start, and ($|:) to end of all tests to make sure we're matching a full path. Also test for (and append if not there) a ':' at the end of $MANPATH; otherwise Linux systems tend to forget how to search system paths.

#if [ "$SSH_AGENT_PID" -a "$SHLVL" = "1" ] ; then
#   eval `/usr/bin/ssh-agent -k`
#fi