I want to count the no of lines in a text file and then the value has to be stored into a environment variable. The command to count the no of lines is
findstr /R
I usually use something more like this
for /f %%a in (%_file%) do (set /a Lines+=1)
The perfect solution is:
FOR /F %%i IN ('TYPE "Text file.txt" ^| FIND /C /V ""') DO SET Lines=%%i
Try this:
@Echo off
Set _File=file.txt
Set /a _Lines=0
For /f %%j in ('Find "" /v /c ^< %_File%') Do Set /a _Lines=%%j
Echo %_File% has %_Lines% lines.
It eliminates the extra FindStr and doesn't need expansion.
- edited to use ChrisJJ's redirect suggestion. Removal of the TYPE
command makes it three times faster.
There is a much simpler way than all of these other methods.
find /v /c "" filename.ext
Holdover from the legacy MS-DOS days, apparently. More info here: https://devblogs.microsoft.com/oldnewthing/20110825-00/?p=9803
Example use:
adb shell pm list packages | find /v /c ""
If your android device is connected to your PC and you have the android SDK on your path, this prints out the number of apps installed on your device.
You don't need to use find.
@echo off
set /a counter=0
for /f %%a in (filename) do set /a counter+=1
echo Number of lines: %counter%
This iterates all lines in the file and increases the counter variable by 1 for each line.
I found this solution to work best for creating a log file that maintains itself:
setlocal enabledelayedexpansion
SET /A maxlines= 10
set "cmd=findstr /R /N "^^" "filename.txt" | find /C ":""
for /f %%a in ('!cmd!') do set linecount=%%a
GOTO NEXT
:NEXT
FOR /F %%A IN ("filename.txt") DO (
IF %linecount% GEQ %maxlines% GOTO ExitLoop
echo %clientname% %Date% %Time% >> "filename.txt")
EXIT
:ExitLoop
echo %clientname% %Date% %Time% > "filename.txt"
EXIT
Environmental variables included are %clientname% the computername of the remote client %Date% is the current date and %Time% the current time. :NEXT is called after getting the number of lines in the file. If the file line count is greater than the %maxlines% variable it goes to the :EXITLOOP where it overwrites the file, creating a new one with the first line of information. if it is less than the %maxlines% variable it simply adds the line to the current file.