diff --git a/functions.sh b/functions.sh
index c64c299..d3ca1ef 100755
--- a/functions.sh
+++ b/functions.sh
@@ -276,6 +276,18 @@ function commandIsWorking {
 
 }
 
+# return latest line of commande output
+# arg1: chroot dir
+# arg2: command to be run
+function commandOutput {
+  chroot=$1
+  shift
+  command="$@"
+  result=$(chroot ${chroot} bash -c "$command" 2> /dev/null)
+  ret=$?
+  if [ $ret -eq 0 ] ; then e ${result:=0} ; else e 0 ; fi
+  }
+
 # get num of files in given dir
 # arg1: dir
 function numFilesInDir {