run_iw_scan() - /etc/rc.d/rc.network - pupylinux

# lines 214 to 254 of /etc/rc.d/rc.network
# http://www.pearltrees.com/s243a/run-iw-scan-etwork-puppylinux/id16440743
#  Dougal: stick the wireless scan into a function, since we're doing some tricks
#+ to try and ensure it works...
run_iw_scan(){
    # add sleeping a bit for pcmcia...
    #grep -q "^pcmcia:" /sys/class/net/$INTERFACE/device/modalias &&    sleep 5
    #case $INTMODULE in *_cs) sleep 5 ;; esac
    checkIsPCMCIA
    [ -n "$IsPCMCIA" ] && sleep 5
    # no try runing twice and redirecting to files, then use bigger one...
    # clean up any old files
    rm /tmp/iwscan*.tmp 2>/dev/null
    iwlist "$INTERFACE" scan >/tmp/iwscan1.tmp 2>&1
    if [ -n "$IsPCMCIA" ] ; then
      sleep 1
    else
      usleep 100000
    fi
    iwlist "$INTERFACE" scan >/tmp/iwscan2.tmp 2>&1
    ScanListFile=$(du -b /tmp/iwscan*.tmp |sort -n | tail -n1 |cut -f2)
    # now try scanning
    #SCAN_LIST=$(iwlist "$INTERFACE" scan | grep 'Cell\|ESSID\|Mode\|Frequency\|Encryption\|Channel')
    #SCAN_LIST=$(grep 'Cell\|ESSID\|Mode\|Frequency\|Encryption\|Channel' $ScanListFile)
    #rm /tmp/iwscan*.tmp
    ## no, use the file all the time, so just get the cell list
    CELL_LIST=$(grep -Eo "Cell [0-9]+" $ScanListFile | cut -f2 -d " ")
    # if it failed, try sleeping and trying again
    #if [ -z "$SCAN_LIST" ] ; then
    if [ -z "$CELL_LIST" ] ; then
        # with pcmcia try ejecting and inserting (this is done in wag-profiles.sh)
        if [ -n "$IsPCMCIA" ] ; then
            pccardctl eject
            pccardctl insert
            sleep 1
        fi
        sleep 1
        #SCAN_LIST=$(iwlist "$INTERFACE" scan | grep 'Cell\|ESSID\|Mode\|Frequency\|Encryption\|Channel')
        iwlist "$INTERFACE" scan >/tmp/iwscan3.tmp 2>&1
        ScanListFile="/tmp/iwscan3.tmp"
        CELL_LIST=$(grep -Eo "Cell [0-9]+" $ScanListFile | cut -f2 -d " ")
    fi
}