Steve Litt <[email protected]> writes:
> On Sun, 31 Jan 2016 18:20:12 -0500
> Steve Litt <[email protected]> wrote:
[...]
> ===========================================
> #!/bin/sh
> lineno=${1:-1}
>
> fn=`mktemp`
>
> ip -o link | \
> cut -d ' ' -f2 | \
> grep ^w | \
> tr -d : > $fn
>
> maxdev=`wc -l $fn | cut -d ' ' -f 1`
> if test $maxdev -lt $lineno; then
> echo =max$maxdev
> else
> head $fn -n $lineno | \
> tail -n 1
> fi
> rm $fn
> ===========================================
[...]
> There are probably better ways to write this script, but I think the
> way I have it here exhibits the behavior I'd like.
'Better' is often very much a matter of opinion but here's one which
doesn't need a temporary file:
---------
#!/bin/sh
want=${1:-1}
got=0
for dev in `ip -o link | sed -n 's/[^:]*: *\(w[^:]*\).*/\1/p'`;
do
got=`expr $got + 1`
test $got -eq $want && {
echo $dev
exit 0
}
done
echo =max$got
--------
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