jilles accurately advises that, in the context of shell redirection, the `:'

builtin is processed specially and thus the `: > file' syntax for example
will cause premature termination of the current shell on redirection-error.

The `true' builtin on the other-hand is not included in this special
processing (for compatibility reasons to satisfy legacy scripts programmed
for systems where `true' is not a builtin).

Change bare `: > file' syntax into `true > file' syntax to prevent premature
shell termination in the event of redirection-error.

NOTE: Instances of `: > file' that appear within a sub-shell have been left
unmodified as these will not cause premature termination of the main script.

Reviewed by:	jilles, adrian (co-mentor)
Approved by:	adrian (co-mentor)

usr.sbin/bsdconfig/timezone/share/zones.subr

@@ -610,7 +610,7 @@ f_install_zoneinfo()
 
 	# Save knowledge for later
 	if [ "$REALLYDOIT" -a $rv -eq $SUCCESS ]; then
-		if : 2> /dev/null > "$_PATH_DB"; then
+		if true 2> /dev/null > "$_PATH_DB"; then
 			cat <<-EOF > "$_PATH_DB"
 			$zoneinfo
 			EOF