On Sat, Sep 27, 2003 at 10:36:59AM -0600, Brett Glass wrote: > I need to write a program or script that modifies > /etc/ppp/ppp.secrets on the fly to add, change, and remove > passwords. One thing I do NOT want is for replacement of the file to > interfere with a login that's occurring at the same time. What's the > best way to slip a new version of the file in without messing up an > instance of userland PPP that might check it at just the wrong > moment?
This is the way I do things like this; note that this does not do any locking on the file (man 1 lockf). #!/bin/sh -e REALNAME=/etc/ppp/secrets TEMPNAME=/etc/ppp/secrets.$$ trap "echo Error occurred 1>&2; rm -f $TEMPNAME" EXIT INT cp $REALNAME $TEMPNAME # do your stuff to $TEMPNAME trap "" INT # don't interrupt the FS ops unlink $REALNAME ln $TEMPNAME $REALNAME unlink $TEMPNAME trap EXIT INT -- Marc Ramirez Blue Circle Software Corporation 513-688-1070 (main) 513-382-1270 (direct) http://www.bluecirclesoft.com http://www.mrami.com (personal) _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
