i need to write a script that can loop through ej.192.162.0.0 to 192.162.0.256
find the ones that are connected and the ones not connected
write the name , ip address and connection status of each one in a file
to later use it in perl to create a web page with the information
thanks guys (1 Reply)
need to check on some hosts and send an email if there status changes
I wanna put together a script in bash that will allow me to check the up/down state of a single host via ping
i want it to run in a continuous loop so I can just fire the script and forget about it(dont want cron to drive... (2 Replies)
Hi Gurus
I have a file called /tmp/CMDB which looks like this
serial: 0623AN1208
hostname: server1
model: x4100
assetID: 1234
I am writing a for loop that will go through this file line by line creating a variable of itself. Using the first iteration of the loop (i.e. the first line) as... (6 Replies)
I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends.
As an example I've written a script called question (The fist command is to show what is the contents of the... (2 Replies)
Hi,
I am using su within a for loop. As you might expect, it prompts for password during each loop execution. Here is my piece of code:
for i in $LIST
do
if
then
DATABASE=`echo $i | awk -F "|" '{ print $1 }'`
USER_ID=`echo $i | awk -F "|" '{ print $2 }'`
su - apstage -c... (1 Reply)
Hi all
Sorry for the basic question, but i am writing a shell script to get around a slightly flaky binary that ships with one of our servers. This particular utility randomly generates the correct information and could work first time or may work on the 12th or 100th attempt etc !.... (4 Replies)
Hi All
i have an issue with ping, we are using dhcp and so if the machine has been offline and i ping it, i get " ping: unknown host <hostname>
is there a way i can stick a loop somewhere so it would keep trying when it got the unknown host error and then when the machine came back online... (2 Replies)
Hi All,
Below is the very simple code snippet but it si giving me syntax error
#!/bin/bash
#To ensure If JMS directory exists or not
ServerName=$(hostname)
#To ensure If JMS directory exists or not
echo $ServerName
if ;
then
echo "Inside First If"
if ;
then
echo 'JMS... (4 Replies)
I'm taking a unix class and need to countdown to 0 from whatever number the user inputs. I know how to do this with a while or until loop but using the for loop is throwing me off....
I know I can use an if-then statement in my for loop but can I include a while loop in my for loop? (3 Replies)
Running 3650 switch. I have this odd issue where I cannot get 4 new Centos 7 boxes pinging out on public IPs (nor pinging in), only gateway .1 and first public IP .2
This is what I see, which doesn't look normal. How do I fix this?
The server itself is configured fine (Centos 7)
# cat... (0 Replies)
Discussion started by: Bashed
0 Replies
LEARN ABOUT DEBIAN
simple
Simple action in tc(8) Linux Simple action in tc(8)NAME
simple - basic example action
SYNOPSIS
tc ... action simple [ sdata STRING ] [ index INDEX ] [ CONTROL ]
CONTROL := { reclassify | pipe | drop | continue | ok }
DESCRIPTION
This is a pedagogical example rather than an actually useful action. Upon every access, it prints the given STRING which may be of arbi-
trary length.
OPTIONS
sdata STRING
The actual string to print.
index INDEX
Optional action index value.
CONTROL
Indicate how tc should proceed after executing the action. For a description of the possible CONTROL values, see tc-actions(8).
EXAMPLES
The following example makes the kernel yell "Incoming ICMP!" every time it sees an incoming ICMP on eth0. Steps are:
1) Add an ingress qdisc point to eth0
2) Start a chain on ingress of eth0 that first matches ICMP then invokes the simple action to shout.
3) display stats and show that no packet has been seen by the action
4) Send one ping packet to google (expect to receive a response back)
5) grep the logs to see the logged message
6) display stats again and observe increment by 1
hadi@noma1:$ tc qdisc add dev eth0 ingress
hadi@noma1:$tc filter add dev eth0 parent ffff: protocol ip prio 5
u32 match ip protocol 1 0xff flowid 1:1 action simple sdata "Incoming ICMP"
hadi@noma1:$ sudo tc -s filter ls dev eth0 parent ffff:
filter protocol ip pref 5 u32
filter protocol ip pref 5 u32 fh 800: ht divisor 1
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
match 00010000/00ff0000 at 8
action order 1: Simple <Incoming ICMP>
index 4 ref 1 bind 1 installed 29 sec used 29 sec
Action statistics:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
hadi@noma1$ ping -c 1 www.google.ca
PING www.google.ca (74.125.225.120) 56(84) bytes of data.
64 bytes from ord08s08-in-f24.1e100.net (74.125.225.120): icmp_req=1 ttl=53 time=31.3 ms
--- www.google.ca ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 31.316/31.316/31.316/0.000 ms
hadi@noma1$ dmesg | grep simple
[135354.473951] simple: Incoming ICMP_1
hadi@noma1$ sudo tc/tc -s filter ls dev eth0 parent ffff:
filter protocol ip pref 5 u32
filter protocol ip pref 5 u32 fh 800: ht divisor 1
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
match 00010000/00ff0000 at 8
action order 1: Simple <Incoming ICMP>
index 4 ref 1 bind 1 installed 206 sec used 67 sec
Action statistics:
Sent 84 bytes 1 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
SEE ALSO tc(8)tc-actions(8)iproute2 12 Jan 2015 Simple action in tc(8)