Thomas Rast <trast@xxxxxxxxxxxxxxx> writes:
>> "$GIT_DIR/hooks/pre-rebase" ${1+"$@"}
> ...
> IIRC this particular usage was designed to suppress warnings about unset
> variables.
This is an old-timer's habit to work around buggy implementations of
Bourne shells where they failed to expand "$@" to nothing when there
is no parameters, feeding a single empty argument to the command.
By explicitly writing ${1+...}, the construct makes sure that when
we have no parameter (i.e. $1 is unset) we do not even look at "$@".
It is equivalent to "$@" in correctly implemented shells.
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