输出给定参数。 更多信息:https://www.gnu.org/software/coreutils/echo.
echo "{{Hello World}}"
echo "{{My path is $PATH}}"
echo -n "{{Hello World}}"
echo "{{Hello World}}" >> {{file.txt}}
echo -e "{{Column 1\tColumn 2}}"
echo %errorlevel%
和 $lastexitcode
):echo $?