change ``bash headers to ``sh

basics/soft_links.md

@@ -7,7 +7,7 @@ When a program encounters a soft link, it will make a  guess at whether it shoul
 
 To make a soft link to a file in the current directory, linking is easy:
 
-```bash
+```sh
 fortune > $file_1
 ln -s $file_1 $link_1
 ```
@@ -27,14 +27,14 @@ dir_0/
 
 Inside `dir_1`, making a soft link to `dir_0/file_1` would mean putting the directions to that file:
 
-```bash
+```sh
 cd dir_1
 ln -s ../file_1 link_1
 ```
 
 The real content of the file is just '`../file_1`, so making it from another directory would mean writing exactly the same address to that file:
 
-```bash
+```sh
 ln -s ../file_1 dir_2/link_2
 ```
 
@@ -54,7 +54,7 @@ dir_0/
 
 Since it's just an address, you can delete the original file, then make another.
 
-```bash
+```sh
 rm file_1
 ls -l dir_1/
 fortune > file_1
@@ -65,7 +65,7 @@ cat dir_1/link_1
 
 Last, let's make a link from `dir_2/link_2` to `dir_1/file_1` (this will delete the old link):
 
-```bash
+```sh
 ln -s -f ../dir_1/file_1 dir_2/link_2
 cat dir_2/link_2
 ```