Fixed typo.

Author: janpgit

intro.tex

@@ -1976,7 +1976,7 @@
 It may not work like that in your shell as very probably your system will not
 have a French localization package installed.
 \item When replacing the current process image with a different program (page
-\pageref{EXEC}), the child will by default, get the full environment from its
+\pageref{EXEC}), the child will by default get the full environment from its
 parent.  You can pass a different array as an argument to the function
 \texttt{exec()}, including passing an empty one.
 \item Different commands use different environment variables.  That should be