diff -Ndurp bzip2-1.0.6/bzgrep bzip2-1.0.6-fix-bashisms/bzgrep
--- bzip2-1.0.6/bzgrep	2007-01-03 04:00:55.000000000 +0200
+++ bzip2-1.0.6-fix-bashisms/bzgrep	2014-10-19 02:07:30.036033876 +0300
@@ -63,9 +63,7 @@ for i do
     bzip2 -cdfq "$i" | $grep $opt "$pat"
     r=$?
   else
-    j=${i//\\/\\\\}
-    j=${j//|/\\|}
-    j=${j//&/\\&}
+    j=$(echo "$i" | sed 's/\\/&&/g;s/|/\\&/g;s/&/\\&/g')
     j=`printf "%s" "$j" | tr '\n' ' '`
     bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"
     r=$?