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Full Discussion: Multiple lines combined into one for netstat (or ls)
Top Forums Shell Programming and Scripting Multiple lines combined into one for netstat (or ls) Post 302425236 by brsett on Thursday 27th of May 2010 11:37:01 AM
Old 05-27-2010
Multiple lines combined into one for netstat (or ls)
Hello

So I understand when I do the following

Code:
used_ports=$(netstat -nat |cut -d : -f 2 |cut -d ' ' -f 1)

that the output will look like this

Code:
Active Proto 5298 22 631 55012 56093 39672 43196 56619 39677 36103 
38453 41413 56137 37902 41410 41414 43195 38426 49253 38420 34273 
49241 56124 38433 34935 56121 49255 38451 45457 58900 49240 34274 
45535 54558 49242 41411 36104 38452 49254 59107

But I actually want to then grep for individual ports -- impossible if all are on the same line. I need to make sure that 10 or 15 consecutive ports I need are not in use. easy to do if I call netstat 10-15 times and grep for each port seperately, but that seems expensive. Is there a way to store the netstat output and then ensure the ports I need are not in use?

I actually have similar problems with ls occasionally, so explaining why the output gets stuck on a single line, and then how to work with it in general would be useful to me.
 

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LEARN ABOUT DEBIAN

netstat-nat

netstat-nat(1)						      General Commands Manual						    netstat-nat(1)

NAME

       netstat-nat - Show the natted connections on a linux iptable firewall

SYNOPSIS

       netstat-nat [options]

DESCRIPTION

       netstat-nat Displays NAT connections managed by netfilter/iptables which comes with the > 2.4.x linux kernels.

       The  program  reads  its information from '/proc/net/ip_conntrack' or '/proc/net/nf_conntrack', which is the temporary conntrack-storage of
       netfilter.

OPTIONS

       -h     displays help

       -n     don't resolve IPs/portnumbers to host/portnames

       -p <protocol>
	      display NAT connections with protocol selection (see /etc/protocols)

       -s <source host>
	      display connections by source IP/hostname

       -d <destination host>
	      display connections by destination IP/hostname

       -S     display SNAT connections

       -D     display DNAT connections

       -L     display only connections to NAT box self (doesn't show SNAT & DNAT)

       -R     display only connections routed through the NAT box (doesn't show SNAT & DNAT)

       -x     extended view of hostnames

       -r <src|dst|src-port|dst-port|state>
	      sort connections

       -o     no output header

       -N     display NAT box connection information (only valid with SNAT & DNAT)

       -v     prints version

FILES

       /proc/net/ip_conntrack or /proc/net/nf_conntrack

SEE ALSO

       http://www.tweegy.nl/projects/netstat-nat/
       http://www.netfilter.org/

AUTHOR

       netstat-nat has been written by D.Wijsman danny@tweegy.nl
       The manual page has been written by marceln@xs4all.nl

								     July 2002							    netstat-nat(1)
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