China DOS Union

How can I use batch processing to calculate how many lines there are in a text file? Then use that total line count to generate a random number and display a random line.

How exactly should I write the statement...

Using findstr /n will tell you how many lines a file has. For details, type findstr /? at the command line to check.
To see how many lines are in the file test.txt, if you use a for statement, you can do it like this:

@echo off for /f "tokens=1 delims=:" %%i in ('findstr /n .* test.txt') do set num=%%i echo There are %num% lines in file test.txt pause>nul

　　There was an error when merging; the OP is theoldman, not ccwan. Please forgive me, both of you, and everyone else please bear with it.
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　　The problem of misaligned post numbers has already been fixed by the admin. Everyone below, please make the corresponding changes to your reply content in time.

[ Last edited by namejm on 2007-2-6 at 04:11 PM ]

Moderator, you're too modest. Actually, being the OP is pretty nice too, I just don't know whether the credits would accordingly go up by 4 points instead of 2?^_^

[ Last edited by ccwan on 2007-2-7 at 04:22 AM ]

ccwan, if I want to display line 2, and this 2 is a variable, what exactly should the format be?
(Please forgive a newbie like me for asking such a simple question, I really couldn't find how to write it T_T~~)

[ Last edited by namejm on 2007-2-6 at 03:52 PM ]

　　The demo code is as follows:
@echo off set num= set /p num= Please enter the line number to display: set /a num-=1 for /f "delims= eol=" %%i in ('more +%num% test.txt') do echo "%%i"&goto end :end pause
　　You can also use findstr /n, or display it through a counter.

Moderator, what does this more do?

Use more/? and command /? more often in the CMD window.

Just do as the poster above said.

[ Last edited by ccwan on 2007-2-7 at 05:06 AM ]

ccwan, your post on reply #4 is really hard on the eyes.

Sorry everyone, the starting color and the ending color were set too light. You can select it to reverse it to white on black and it'll be clear.

Also, I suggest the OP read the basic command help more.

Thanks to the helpful people above s ^_^

If I still can't understand it, I'll come back and bother everyone again.