Updated redirection example

docs/examples/redirection.md

@@ -44,4 +44,57 @@ exim -iz | xargs exim -Mrm
 
 There will be quite a few times when you will want to redirect the output of a command into a file, this could be a temporary file with some data in it that you need to work with
 
-The Easiest way 
+`[root@gunicorn scratch]# ps aux > ps.out` will save the output of `ps aux` to ps.out, this is useful as we now have a snapshot of what was running and we can run some commands on it without the data changing
+
+You also may need to redirect errors from a command so they do not make a mess of your output that you have, for example you are running a find command on a directory and your user account does not have full permissions for all the directories/files your output will have
+
+```bash
+find: ‘/boot/efi/EFI/centos’: Permission denied
+find: ‘/boot/grub2’: Permission denied
+find: ‘/proc/tty/driver’: Permission denied
+find: ‘/proc/1/task/1/fd’: Permission denied
+find: ‘/proc/1/task/1/fdinfo’: Permission denied
+find: ‘/proc/1/task/1/ns’: Permission denied
+```
+In this case we can redirect the STDERR out to a special file that nulls all data that is sent to it, the file in this case is `/dev/null`
+
+```bash
+[testingacc@gunicorn testing]$ find
+.
+./dir1
+./dir1/file1
+./dir1/file2
+./dir1/file3
+./dir2
+find: ‘./dir2’: Permission denied
+```
+
+If we run the same command but append `2> /dev/null` it will remove the errors from the output
+
+```bash
+[testingacc@gunicorn testing]$ find 2> /dev/null
+.
+./dir1
+./dir1/file1
+./dir1/file2
+./dir1/file3
+./dir2
+```
+
+You can also redirect the errors to a file for later use if required, this is done in the same way but you need to swap `/dev/null` with the filename/path you want to save the errors to
+
+```bash
+[testingacc@gunicorn testing]$ find 2> error.log
+.
+./dir1
+./dir1/file1
+./dir1/file2
+./dir1/file3
+./dir2
+./error.log
+
+[testingacc@gunicorn testing]$ cat error.log
+find: ‘./dir2’: Permission denied
+```
+
+You can see we now have the error.log file and it contains the 'Permission denied' error and it was not printed to the screen