windows bat knowledge

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The output stored in the variable cmd

Use forto achieve

@echo off
setlocal ENABLEDELAYEDEXPANSION 

for /F %%k in ('tasklist ^| find /i "cmd.exe"  /c') do (
	echo %%k 
	set /a var = %%k + 1
	echo !var! )

As a result, %%kit is stored in the process called cmd.exethe number of processes, and it can use set /amathematical operations

Comparison Operators

EQU - 等于
NEQ - 不等于
LSS - 小于
LEQ - 小于或等于
GTR - 大于
GEQ - 大于或等于

Acquisition path

@echo off
echo 当前盘符：%~d0
echo 当前盘符和路径：%~dp0
echo 当前批处理全路径：%~f0
echo 当前盘符和路径的短文件名格式：%~sdp0
echo 当前CMD默认目录：%cd%
echo 当前盘符：”%~d0"
echo 当前盘符和路径："%~dp0"
echo 当前批处理全路径："%~f0"
echo 当前盘符和路径的短文件名格式："%~sdp0"
echo 当前CMD默认目录："%cd%"

Check whether it exists

@echo off

if not "%1" equ "" (
	echo succeed )

* Note that double quotes must be 1%

Nuo induced echo is not an internal or external command, operable program or batch file

Coding problem, bat only supports ANSI, then use Save As to open the notepad