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File Line Count

Use FIND command to count file lines, store line count into a variable.

Description: Running the FIND command with option /v and empty search string will find all lines
Running the FIND command with option /c will output the line count only.
The FOR command with option /f will parse the output, the line count in this case, and the set command put the line number into the cnt variable.
Script:
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 set file=textfile.txt
set /a cnt=0
for /f %%a in ('type "%file%"^|find "" /v /c') do set /a cnt=%%a
echo %file% has %cnt% lines
Script Output:
 DOS Script Output 
textfile.txt has 50 lines