如何使用管道运算符，箭头运算符查找内容或将输出保存在文件help.txt中？

Question

任何人都可以帮助

git > help.txt #works
git commit > help.txt #works
git commit -h > help.txt #never worked..

同样，管道运算符不起作用...

git commit -h | findstr branch #never works, but
git commit | finsdstr branch #works