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@echo off<br />
type nul &gt;&nbsp;output.txt<br />
for /f &quot;delims=&quot; %%i in (%1) do echo %%i&gt;&gt; output.txt<br />
<br />
--------------------------<wbr /><br />
Save as your_name.bat<br />
<br />
usage: your_name file_to_parse.txt<br />
<br />
Outputs all non-empty lines in file_to_parse to output.txt<br />
<br />
Note that it intentionally wipes out output.txt before writing (just remove the second line to make it always append), and it also puts an endline on the last line even if you did not have one before. &nbsp;Please let me know if either of these are an issue.
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Thanx,<br />
<br />
But if I want to sweep same file not output to output.txt? So I can use syntax like clean.bat and filename to clean is specified inside clean.bat 
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<div class="content wysiwyg-content">
I want to create DOS batch file to loop through file (text files) and delete all empty lines.
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I want to create DOS batch file to loop through file (text files) and delete all empty lines.

@echo off
type nul &gt; output.txt
for /f &quot;delims=&quot; %%i in (%1) do echo %%i&gt;&gt; output.txt

--------------------------
Save as your_name.bat

usage: your_name file_to_parse.txt

Outputs all non-empty lines in file_to_parse to output.txt

Note that it intentionally wipes out output.txt before writing (just remove the second line to make it always append), and it also puts an endline on the last line even if you did not have one before.  Please let me know if either of these are an issue.

Thanx,

But if I want to sweep same file not output to output.txt? So I can use syntax like clean.bat and filename to clean is specified inside clean.bat 

DOS script to delete empty lines inside the file

Microsoft Disk Operating System (MS-DOS) was an operating system for x86-based personal computers, and traces of it are still found in the Windows operating system. DOS is still used in some embedded systems and for certain legacy 16-bit networks.