CVS commit: src/bin/sh

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Sun Oct 31 02:12:01 UTC 2021

Modified Files:
        src/bin/sh: cd.c

Log Message:
PR bin/45390 - fix for folly four

In the pwd builtin, verify that curdir names '.' before
simply printing it.   Never alter PWD or OLDPWD in the
pwd command.

Also while here, implement the (new: coming in POSIX, but has existed
for a while in several other shells) -e option to cd (with -e, cd -P
will exit(1) if the chdir() succeeds, but PWD cannot be discovered).

cd now prints the directory name used (if different from that given,
or cdprint is on) if interactive or (the new bit)in posix mode.

Some additional/changed comments added, and a DEBUG mode trace call
that was accidentally put inside an #if 0 block moved to where it
can do some good.

XXX pullup -9


To generate a diff of this commit:
cvs rdiff -u -r1.50 -r1.51 src/bin/sh/cd.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.