epm-sh-functions: introduce startwith (instead of grep using)

bin/epm-sh-functions

@@ -215,13 +215,28 @@ rhas()
     echo "$1" | grep -E -q -- "$2"
 }
 
+# bash specific
+startwith()
+{
+    # rhas "$1" "^$2"
+    [[ "$1" = ${2}* ]]
+}
+
+is_abs_path()
+{
+    #echo "$1" | grep -q "^/"
+    startwith "$1" "/"
+}
+
 # copied from strings
 is_dirpath()
 {
     [ "$1" = "." ] && return $?
-    rhas "$1" "/"
+    # rhas "$1" "/"
+    startwith "$1" "/"
 }
 
+
 filter_strip_spaces()
 {
         # possible use just
@@ -1012,11 +1027,6 @@ subst()
 }
 fi
 
-is_abs_path()
-{
-    echo "$1" | grep -q "^/"
-}
-
 check_core_commands()
 {
     #which which >/dev/null || fatal "Can't find which command (which or debianutils package is missed?)"