On Tue, 12 Mar 2019 12:14+0100, Trond Endrestøl wrote:
> On Tue, 12 Mar 2019 11:37+0100, Jan Martin Mikkelsen wrote:
>
> > > On 12 Mar 2019, at 10:37, Trond Endrestøl
> > > <trond.endres...@fagskolen.gjovik.no> wrote:
> > > I concocted a shell script, it looks promising:
> > >
> > > #!/bin/sh
> > > #-
> > > # Parallel mounting of ZFS filesystems leaves a chaotic listing of
> > > # mounted filesystems when viewed by df(1).
> > > # Separating the header from the remaining lines and sorting the
> > > # latter before recombining is a viable solution.
> > > #-
> > >
> > > DF=/bin/df
> > >
> > > ${DF} ${@} | grep ^Filesystem
> > > ${DF} ${@} | grep -v ^Filesystem | sort -k 6
> > >
> > > # new-df.sh
> >
> > An alternative sort approach, which handles df arguments which change the
> > number of columns, and only invokes df once:
> >
> > ${DF} "$@" | awk '/^Filesystem/ { print; sort = "sort -k " NF } !
> > /^Filesystem/ { print | sort }’
>
> Well, yes and no, mostly no.
>
> Why are we feeding each line from df(1) separately to sort(1)?
> It defeats the entire purpose. No sorting takes place.
>
> We might be better off accumulating the majority of the lines and
> sorting them in an END block.
How about this?
/bin/df ${@} | /usr/bin/awk '/^Filesystem/ { print; sort = "/usr/bin/sort -sk "
NF-1 } ! /^Filesystem/ { if (length(acc) > 0) acc = acc "\n" $0; else acc = $0;
} END { print acc | sort }'
--
Trond.
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