awk 'BEGIN{while(" w_scan -c PL -x " | getline ) print >> "tmp" }'

awk 'BEGIN{while(" w_scan -I tmp -E 0 -t 3 -F " | getline) print >> "channels" }'

awk 'BEGIN { while (" w_scan -c PL -x " | getline ){split($0, tab, RS) system( " w_scan -I 47" tab[1] "47 -E 0 -t 3 -F " ">>" "channels" )}}'

BEGIN {
  while (" w_scan -c PL -x " | getline ) {
    split($0, tab, RS)
    system( " w_scan -I '47'" tab[1] "'47' -E 0 -t 3 -F >> channels" )
  }
}

#!bin/bash
awk 'BEGIN{while(" w_scan -c PL -x " | getline ) print >> "tmp" }'
awk 'BEGIN{while(" w_scan -I tmp -E 0 -t 3 -F " | getline) print >> "channels" }'

awk '
  BEGIN {
    while(" w_scan -c PL -x " | getline ) print >> "tmp"
    while(" w_scan -I tmp -E 0 -t 3 -F " | getline) print >> "channels"
  }
'

awk 'BEGIN { while(" w_scan -c PL -x " | getline ) print >> "tmp"; while(" w_scan -I tmp -E 0 -t 3 -F " | getline) print >> "channels" }'

awk -f run.awk