bash: ./hello: 权限不够

you can opened three terminal for a try
the 1st terminal # is fault 0
the 2nd terminal # is fault 1
the 3th terminal # is fault 2
then you input the below order in term 2

man gcc > /dev/pts/0

the result will display on term 0
change 0 to 1
the result will display on term 1
...
the 0 refer to the opened terminal # , exm: 0,1,2,3,,,,

then?