checkout fuzzy, but doesn't work

bin/git-checkout-fuzzy-2

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+gcb() {
+  result=$(git branch -a --color=always | grep -v '/HEAD\s' | sort |
+    fzf --height 50% --border --ansi --tac --preview-window right:70% \
+      --preview 'git log --oneline --graph --date=short --pretty="format:%C(auto)%cd %h%d %s" $(sed s/^..// <<< {} | cut -d" " -f1) | head -'$LINES |
+    sed 's/^..//' | cut -d' ' -f1)
+
+  if [[ $result != "" ]]; then
+    if [[ $result == remotes/* ]]; then
+      git checkout --track $(echo $result | sed 's#remotes/##')
+    else
+      git checkout "$result"
+    fi
+  fi
+}
+
+gcb