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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 PLAN9

inet_type

inet_type(4)                                                       File Formats                                                       inet_type(4)

NAME

       inet_type - default Internet protocol type

SYNOPSIS

       /etc/default/inet_type

DESCRIPTION

       The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands.

       The  inet_type  file  can  contain  a  number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be
       assigned a value of IP_VERSION4, IP_VERSION6, or BOTH.

       The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file.  By  default,
       both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by
       setting the value of DEFAULT_IP.  The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that
       will be displayed:

       IP_VERSION4     Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M)
                       and netstat(1M) commands.

       IP_VERSION6     Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       BOTH            Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For  example,
       even if the value of DEFAULT_IP is IP_VERSION4, the command

       example% ifconfig -a6

       will display all IPv6 interfaces.

EXAMPLES

       Example 1: Suppressing IPv6 Related Output

       This is what the inet_type file must contain if you want to suppress IPv6 related output:

       DEFAULT_IP=IP_VERSION4

SEE ALSO

       ifconfig(1M), netstat(1M)

SunOS 5.10                                                          16 Jun 1999                                                       inet_type(4)
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