On Wed, Dec 19, 2012 at 11:16:26AM -0800, Xin Li wrote:
> It may be worthy to make sysctl(8) to accept mutiple -f's, but it
> seems to be hard to write shell scripts that utilizes this feature in
> a elegant manner.
This is possible but indeed a bit ugly.
Hard-coding the list of files is not too bad:
shift $#
for _f in /etc/sysctl.d/* /etc/sysctl.conf /etc/sysctl.conf.local; do
[ -r "$_f" ] && set -- "$@" -f "$_f"
done
sysctl "$@"
If the list is passed in the positional parameters it becomes uglier:
_first=1
for _f do
[ -n "$_first" ] && shift $#
_first=
[ -r "$_f" ] && set -- "$@" -f "$_f"
done
sysctl "$@"
This uses for's temporary storage of the words being iterated over,
building a new set of positional parameters in the loop.
An alternative is to append the new list to the old one and to use a
saved copy of $# to remove the old elements afterwards.
It would be nice to store the arguments in a variable but that is not
possible because all characters are valid in pathnames, except the null
character which cannot be used in shell either.
--
Jilles Tjoelker
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