V4/usr/man/man1/chdir.1

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.sh NAME
chdir \*- change working directory
.sh SYNOPSIS
.bd chdir
directory
.sh DESCRIPTION
.it Directory
becomes the new working directory.
The process must have execute permission
on the directory.
The process must have execute (search)
permission in
.it directory.
.s3
Because a new process is created to execute each command,
.it chdir
would be ineffective if it were written as a
normal command.  It is therefore recognized and executed
by the Shell.
.sh "SEE ALSO"
sh(I)
.sh BUGS