source code for unix environments 'cd' command

Question

can anyone tell me where I could find source code for unix environments 'cd' command I want to know how change directory command is implemented.

prolly linux sources..would be good..

Answer 1

using chdir function:

http://www.opengroup.org/onlinepubs/009695399/functions/chdir.html

Answer 2

cd is usually built-in in the shell, you should just look at the code of any shell, e.g. bash, or ash.

The cd command should be ultimately based on the chdir() function, but if you're interested in all the command line expansions, then the source is the shell.

http://en.wikipedia.org/wiki/Comparison_of_computer_shells

Answer 3

Here is a complete explanation how cd works: http://www.cs.ucr.edu/~brett/cs153_w02/syscall.html

The cd Unix command just calls chdir and examines the error codes.