lsf: add --absolute flag to add a leading / onto path names

cmd/lsf/lsf.go

@@ -24,6 +24,7 @@ var (
 	filesOnly bool
 	dirsOnly  bool
 	csv       bool
+	absolute  bool
 )
 
 func init() {
@@ -36,6 +37,7 @@ func init() {
 	flags.BoolVarP(&filesOnly, "files-only", "", false, "Only list files.")
 	flags.BoolVarP(&dirsOnly, "dirs-only", "", false, "Only list directories.")
 	flags.BoolVarP(&csv, "csv", "", false, "Output in CSV format.")
+	flags.BoolVarP(&absolute, "absolute", "", false, "Put a leading / in front of path names.")
 	commandDefintion.Flags().BoolVarP(&recurse, "recursive", "R", false, "Recurse into the listing.")
 }
 
@@ -125,6 +127,15 @@ Eg
     test.sh,449
     "this file contains a comma, in the file name.txt",6
 
+Note that the --absolute parameter is useful for making lists of files
+to pass to an rclone copy with the --files-from flag.
+
+For example to find all the files modified within one day and copy
+those only (without traversing the whole directory structure):
+
+    rclone lsf --absolute --files-only --max-age 1d /path/to/local > new_files
+    rclone copy --files-from new_files /path/to/local remote:path
+
 ` + lshelp.Help,
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(1, 1, command, args)
@@ -149,6 +160,7 @@ func Lsf(fsrc fs.Fs, out io.Writer) error {
 	list.SetSeparator(separator)
 	list.SetCSV(csv)
 	list.SetDirSlash(dirSlash)
+	list.SetAbsolute(absolute)
 
 	for _, char := range format {
 		switch char {