Remove blank lines in a text file?

[tinfanide]

a.txt:

This is a line.

This is a line.


This is a line.

I tried different ways but failed:

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For /F "tokens=* delims=" %%A in (a.txt) Do Echo %%A

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For /F "tokens=* delims=" %%A in (a.txt) Do Echo.%%A

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TYPE a.txt | FINDSTR /V /R ^ $

[Aacini]

This is a line.

This is a line.


This is a line.

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For /F "delims=" %%A in (a.txt) Do Echo %%A

This is a line.
This is a line.
This is a line.

[tinfanide]

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For /F "delims=" %%A in (a.txt) Do Echo %%A

FOR /F : loop thru texts
"delims=" : default=<tab><space> ?
Why "delims=" could return carriage return?
Could ya explain a little bit?

[!k]

"delims=" : default=<tab><space> ?

No.
"delims=" == NO delims
default (<tab><space>) is no delims=...


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FINDSTR /V /R /C:"^$" a.txt