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Here's the original shell, with its idea of the current directory
When we run ./do-cd, the shell forks a subshell to run the script
The subshell runs the cd command
Then the subshell forks again so it can run pwd
pwd reports that the current directory is /tmp, and exits
Then the subshell exits
The original shell never cded anywhere
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Copyright © 2002 M. J. Dominus |