Update 01_the_filesystem.md

duanxiaodong · Jan 25, 2018 · aa35d72 · aa35d72
1 parent 32d7fc5
commit aa35d72
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/Intro_shell/lessons/01_the_filesystem.md b/Intro_shell/lessons/01_the_filesystem.md
@@ -555,7 +555,9 @@ $ rm backup/Mov*
 > The `rm` file permanently removes the file. Be careful with this command. The shell doesn't
 just nicely put the files in the Trash. They're really gone.
 >
-> Same with moving and renaming files. It will **not** ask you if you are sure that you want to "replace existing file". You can use `rm -i` if you want it to ask before deleting the file(s).
+> Same with moving and renaming files. It will **not** ask you if you are sure that you want to "replace existing file".
+> 
+> You can use `-i` modifier with both `rm` and `mv`. This will write a prompt to standard error before moving a file that would overwrite an existing file or ask before deleting the file(s).
 
 We really don't need these backup directories, so, let's delete both. By default, `rm`, will NOT delete directories, but you use the `-r` flag if you are sure that you want to delete the directories and everything within them. To be safe, let's use it with the `-i` flag.