chmod 751 temp sets 751 permissions to the temp folder
-rwxr-x-- x
111 101 001
751
all indicate a permission,
-rwxr-x-- x , 111 101 001, 751 cannot type the expression of authority, the authority level is the same, the above 751 can be replaced with the other two appearances.
ps is used to display the status of the current process.
Permission explanation:
-r-xr-xr--
101 101 100 binary
554
-rw--w---x
110 010 001
621
-rwxrwxr--
111 111 100
774
-r---w---x
100 010 001
421
Summary rule: r means 4, w means 2, x means 1