So far, our chmod examples have affected permissions for all three triplets -- the user, the group, and all others. Often, it's handy to modify only one or two triplets at a time. To do this, simply specify the symbolic character for the particular triplets you'd like to modify before the + or - sign. Use u for the "user" triplet, g for the "group" triplet, and o for the "other/everyone" triplet:

$ chmod go-w scriptfile.sh

We just removed write permissions for the group and all other users, but left "owner" permissions untouched.