ubuntu - bash iterate a list to make a channel hopping -

i want iterate list make channel hopping. value $channel correct in iteration "iw dev" command not getting correct value of $channel.

channellist=(1 3 6 11) while :     channel in "${channellist[@]}"                       sudo iw dev mon0 set channel $channel             echo "$channel"         done             done 

this result in channel switching fast possible unsure if intended. there may not enough time other processes accurately collect data:

$ channellist=(1 3 6 11) $ while : > >     channel in "${channellist[@]}" >         >             time echo command set channel $channel >             echo "$channel" >             sleep 1 >         done > done command set channel 1  real    0m0.000s user    0m0.000s sys 0m0.000s 1 command set channel 3  real    0m0.000s user    0m0.000s sys 0m0.000s 3 command set channel 6  real    0m0.000s user    0m0.000s sys 0m0.000s 6 command set channel 11  real    0m0.000s user    0m0.000s sys 0m0.000s 11 command set channel 1  real    0m0.000s user    0m0.000s sys 0m0.000s 1 ^c $ 

edit:

as can see above information commands ran under 0.0005 s granted echo might lot faster sudo iw still fractions of second.