Users frequently experience problems, and call on a system administrator for help, because they cannot access a program, a file, or a directory that they could previously use.
Whenever you encounter such a problem, investigate one of three areas:
The user's search path may have been changed, or the directories in the search path may not be in the proper order.
The file or directory may not have the proper permissions or ownership.
The configuration of a system accessed over the network may have changed.
This chapter briefly describes how to recognize problems in each of these three areas and suggests possible solutions.