bugfix: don't let user select invalid context number.

* cdlog.sh (cdlog.get_param): Only produce output if
shift succeeds. If shift fails, it means that many
shifts are not possible and the parameters are unaffected.

1 files changed, 2 insertions, 1 deletions

diff --git a/cdlog.sh b/cdlog.sh
index 32c65de..c909d65 100644
--- a/cdlog.sh
+++ b/cdlog.sh
@@ -37,8 +37,9 @@ cdlog.args()
 # Utility for nth positional param
 cdlog.get_param()
 {
-    shift $1
+  if shift $1 ; then
     echo "$1"
+  fi
 }
 
 # Read state from ~/.cdlog.dirs