Re: git-update-index -q

Karl Chen [off-list ref] writes:

The git-update-index man page entry for -q says:

       -q
           Quiet. If --refresh finds that the index needs an
           update, the default behavior is to error out. This
           option makes git-update-index continue anyway.

Can someone explain this to me?  As far as I can tell,
git-update-index without -q does not error out after the first
update.

: gitster j; git init
Initialized empty Git repository in /var/tmp/j/.git/
: gitster j/master; >afile; git update-index --add afile
: gitster j/master; echo a >afile
: gitster j/master; git update-index --refresh; echo $?
afile: needs update
1
: gitster j/master; git update-index -q --refresh; echo $?
0
: gitster j/master; exit