input of while loop to come from output of `command`

Question

#I used to have this, but I don\'t want to write to the disk
#
pcap=\"somefile.pcap\"
tcpdump -n -r $pcap > all.txt
while read line; do  
  ARRAY[$c]=\"$line\"
  c=$(         


        

Answer 1

If you don't care about being bourne, you can switch to Perl:

my $pcap="somefile.pcap";
my $counter = 0;
open(TCPDUMP,"tcpdump -n -r $pcap|") || die "Can not open pipe: $!\n";
while () {
    # At this point, $_ points to next line of output
    chomp; # Eat newline at the end
    $array[$counter++] = $_;
}

Or in shell, use for:

for line in $(tcpdump -n -r $pcap)  
do  
 command  
done