====== SED - Numbering - Number each line of a file (simple left alignment) ======

Using a tab instead of space will preserve margins.

<code bash>
sed = filename | sed 'N;s/\n/\t/'
</code>

<WRAP info>
**NOTE:**  **=** is used to number the line. 

The expression **\t** is used to indicate a tab character (0x09) in the scripts.

Some versions of sed do not recognize the '\t' abbreviation, so when typing these scripts from the command line, you should press the TAB key instead.

'\t' is supported as a regular expression.

</WRAP>

----

===== Example =====

Running that command again this file:

<file bash testfile>
aaa
bbb
ccc
</file>

returns:

<file bash testfile>
1	aaa
2	bbb
3	ccc
</file>