add -p for some mkdirs and protect vars from expanding out of existence

(cherry picked from commit 9485913bdbaa8fda0c43eedd788f860518da8d74)

diff --git a/install-dgl-nh500 b/install-dgl-nh500
index 6a08f39af9490e7131753f6e7392c3ac38f665ae..7729213aa2382c030c65aab76c2fef381bf52d13 100644 (file)
--- a/install-dgl-nh500
+++ b/install-dgl-nh500
@@ -419,8 +419,8 @@ if [ -n "$INSTALLNH" ]; then
   LIBS="$LIBS `findlibs /$NETHACKBIN`"
   LHACKDIR="`echo "$HACKDIR" | awk -F/ 'BEGIN {OFS=FS} {NF-=1; print}'`"
   LPLAYGROUND="`echo "$PLAYGROUND" | awk -F/ 'BEGIN {OFS=FS} {NF-=1; print}'`"
-  mkdir $LHACKDIR
-  mkdir $LPLAYGROUND
+  mkdir -p "$LHACKDIR"
+  mkdir -p "$LPLAYGROUND"
   cp -r "/$HACKDIR" "$LHACKDIR/"
   cp "/$NETHACKBIN" "$HACKDIR/$NHBINFILE"
   ln -s "/$HACKDIR/$NHBINFILE" bin/nh500