Add separate relink command

Also rejigged install to accomodate FreeBSD, and update before installing.

relink

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+#
+# Adapted from Junegunn Choi (junegunn.c@gmail.com)
+# https://github.com/junegunn/dotfiles/blob/master/install
+
+cd "$(dirname "${BASH_SOURCE[0]}")" || exit 1
+
+BASE=$(pwd)
+IS_MAC=0
+IS_LINUX=0
+IS_FREEBSD=0
+case $(uname -s) in
+    Darwin) IS_MAC=1 ;;
+    Linux) IS_LINUX=1 ;;
+    FreeBSD) IS_FREEBSD=1 ;;
+    *) echo "Unknown OS" ;;
+esac
+
+# RC files
+
+mkdir -pv bak
+for rc in *rc *profile tmux.conf bashrc.d mutt ; do
+  if [ ! -r $rc ] ; then
+    continue
+  fi
+  [ "$(realpath ~/."$rc")" == "$BASE/$rc" ] 
+  if [ $? -ne 0 ] ; then
+    [ -e ~/."$rc" ] && mv -v ~/."$rc" bak/."$rc"
+    ln -sfv "$BASE/$rc" ~/."$rc"
+  fi
+done
+
+# scripts
+mkdir -p ~/bin
+for bin in $BASE/bin/*; do
+  BIN_NAME=$(basename $bin)
+  [ "$(realpath ~/bin/$BIN_NAME)" == "$bin" ]
+  if [ $? -ne 0 ] ; then
+    ln -svf "$bin" ~/bin
+  fi
+done
+