1printenv () produces:
2boot=
3console=*
4haltaction=h
5testaction=q
6systype=0x00020000
7getenv ("systype") == 0x00020000
8getenv ("crap") == NULL
9setenv ("crap", "50"):
10printenv () produces:
11boot=
12console=*
13haltaction=h
14testaction=q
15systype=0x00020000
16crap=50
17setenv ("haltaction", "cheese"):
18printenv () produces:
19boot=
20console=*
21haltaction=cheese
22testaction=q
23systype=0x00020000
24crap=50
25unsetenv ("console"):
26printenv () produces:
27boot=
28haltaction=cheese
29testaction=q
30systype=0x00020000
31crap=50
32unsetenv ("crap2"):
33Variable not found.
34printenv () produces:
35boot=
36haltaction=cheese
37testaction=q
38systype=0x00020000
39crap=50
40