ref: eca2dbed8b9872f8071b0e8ddc2d1da3f097f283
dir: /rc/bin/usps/
#!/bin/rc rfork en if(! ~ $#* 1) { echo usage: usps 01601531218002685498 >[1=2] exit usage } rfork e hget -p 'qtc_tLabels1='^$1 https://tools.usps.com/go/TrackConfirmAction | uhtml | htmlfmt > /tmp/usps.$pid sam -d /tmp/usps.$pid >[2] /dev/null <<'!' ,/Your Label Number/-1d /Check on Another Item/,$d /id=\"error-tLabels\"/,$d ,p ! rm /tmp/usps.$pid