symbolic link affecting program behaviour

symbolic links affect program behaviour ? how?

In a C program, the command line is stored in argv, which is short for argument vector.

The progam's name is the first element of argv, i.e. argv[0].

Clearly in the case of halt and reboot, the program is changing its behavior based on argv[0].

# reboot

ps -p -o cmd or cat /proc/cmdline.

so in program depending upon argv[0] behaviour changes !


Ref: http://unix.stackexchange.com/questions/6787/why-do-some-symbolic-links-affect-program-behavior