checking if iptables are set on a system in script

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I'm writing a script in bash and I need to check if iptables are set...I have this:



if [ `iptables-save | grep '^-' | wc -l` > 0 ]
then
 echo "Iptables already set, skipping..........!"
else
 Here the iptables get set


But it's not working as expected....



PROBLEM:



I did iptables-save and it created this:



$iptables-save
# Generated by iptables-save v1.6.0 on Tue Oct 16 02:48:41 2018
*filter
:INPUT ACCEPT [2:266]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [2:116]
COMMIT
# Completed on Tue Oct 16 02:48:41 2018


QUESTION:



Do you have a better/working way of checking if iptables are set....my system is Debian 9



bash -version
GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>





bash shell-script iptables programming debian-stretch






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    up vote
    0
    down vote

    favorite












    I'm writing a script in bash and I need to check if iptables are set...I have this:



    if [ `iptables-save | grep '^-' | wc -l` > 0 ]
    then
     echo "Iptables already set, skipping..........!"
    else
     Here the iptables get set


    But it's not working as expected....



    PROBLEM:



    I did iptables-save and it created this:



    $iptables-save
    # Generated by iptables-save v1.6.0 on Tue Oct 16 02:48:41 2018
    *filter
    :INPUT ACCEPT [2:266]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [2:116]
    COMMIT
    # Completed on Tue Oct 16 02:48:41 2018


    QUESTION:



    Do you have a better/working way of checking if iptables are set....my system is Debian 9



    bash -version
    GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
    Copyright (C) 2016 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>





    bash shell-script iptables programming debian-stretch






    share

























      up vote
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      up vote
      0
      down vote

      favorite











      I'm writing a script in bash and I need to check if iptables are set...I have this:



      if [ `iptables-save | grep '^-' | wc -l` > 0 ]
      then
       echo "Iptables already set, skipping..........!"
      else
       Here the iptables get set


      But it's not working as expected....



      PROBLEM:



      I did iptables-save and it created this:



      $iptables-save
      # Generated by iptables-save v1.6.0 on Tue Oct 16 02:48:41 2018
      *filter
      :INPUT ACCEPT [2:266]
      :FORWARD ACCEPT [0:0]
      :OUTPUT ACCEPT [2:116]
      COMMIT
      # Completed on Tue Oct 16 02:48:41 2018


      QUESTION:



      Do you have a better/working way of checking if iptables are set....my system is Debian 9



      bash -version
      GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
      Copyright (C) 2016 Free Software Foundation, Inc.
      License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>





      bash shell-script iptables programming debian-stretch






      share















      I'm writing a script in bash and I need to check if iptables are set...I have this:



      if [ `iptables-save | grep '^-' | wc -l` > 0 ]
      then
       echo "Iptables already set, skipping..........!"
      else
       Here the iptables get set


      But it's not working as expected....



      PROBLEM:



      I did iptables-save and it created this:



      $iptables-save
      # Generated by iptables-save v1.6.0 on Tue Oct 16 02:48:41 2018
      *filter
      :INPUT ACCEPT [2:266]
      :FORWARD ACCEPT [0:0]
      :OUTPUT ACCEPT [2:116]
      COMMIT
      # Completed on Tue Oct 16 02:48:41 2018


      QUESTION:



      Do you have a better/working way of checking if iptables are set....my system is Debian 9



      bash -version
      GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
      Copyright (C) 2016 Free Software Foundation, Inc.
      License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>





      bash shell-script iptables programming debian-stretch




      bash shell-script iptables programming debian-stretch





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