parse_iwinfo_scan.awk

# Take output from iwinfo "$INTERFACE" scan command
# ... combine each stanza (record) into a single line and
# prefix with hostname
# Call with -v h="$HOSTNAME"

BEGIN {h=sprintf("%s:\t", h); line=h};
/^[^ ]/ {print line; line=h};
/^ /    {line=sprintf("%s %s", line, $0)};
END {print line}

# Explanation:
##  mini-state machine parser: prefix set by -v command line arg; then formatted; 
##  any line starting with non-space dumps previous state and starts new state with just prefix
##  any other line (starts with a space) adds to current (line) state
##  dump final state (line) at END
# "extra" semicolons on line endings allow cut-n-paste direct to command line