Solved

Unix script to PING a list of devices and output the result to a txt file

Posted on 2014-11-04
8
531 Views
Last Modified: 2014-12-08
Hi

Im very new to Unix scripting and I'm having trouble running a basic script.  Id like to create a Unix script to PING a list of devices and output the result to a txt file.

Im trying to pull the list of devices from a txt file and then output the result to a txt file.

here is what I have so far.
--------------------------------------------------------------------------------------------------------------------------------------------------
#! /bin/bash

for $i in 'cat serverlist'
do
ping $i >> output.txt
done
----------------------------------------------------------------------------------------------------------------------------------------------------

I have tested this on a Cygwin installed on my windows box but i get the following error.

$ ./_Ping.sh
./_Ping.sh: line 2: $'\r': command not found
./.sh: line 4: syntax error near unexpected token `$'do\r''
'/.sh: line 4: `do

Any ideas?
0
Comment
Question by:tjoconnor
  • 4
  • 2
  • 2
8 Comments
 
LVL 23

Accepted Solution

by:
savone earned 500 total points
ID: 40421430
You need backticks (not single quotes) to execute a command.  Also ping will continue forever in linux unless you put a count on it.

#!/bin/bash
for i in `cat serverlist`;
do
ping -c 2 $i >> ping
done
0
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 40421432
Several: problems:

1) Use backticks or $( ) around the "cat" command and don't use "$i" (that's the content of the variable "i") in the "for" line, use "i" alone:

for i in $(cat serverlist)
do
ping -c 1 $i >> output.txt
done

2) Your script file contains "carriage return + line feed" at the line ends. This is DOS standard and is wrong in Unix, which uses "linefeed" alone.
If you transferred the script file from Windows via FTP transfer it again using the "ASCII" transfer method, or edit the file in Unix and remove the extra carriage return characters.

3) Limit the number of ping attempts, so it will not run endlessly (see above)
0
 
LVL 23

Expert Comment

by:savone
ID: 40421433
To explain further:

To execute a command in the for loop you have to use backticks (under the tilde on the keyboard) not single quotes.

The command "ping -c 2" tells the system to only ping it twice, otherwise it will go on forever and the script will never stop.
0
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 40421445
Note:

If you expect error messages from the "ping" command take care to store these messages in the log file or in a separate error log file instead of displaying them on your terminal:

1) One file:

ping -c 1 $i >> output.txt 2>&1

2) Separate error log:

ping -c 1 $i >> output.txt 2>>errors.txt
0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 

Author Comment

by:tjoconnor
ID: 40421507
Thanks for the responses. I seem to be ok with the file now as there is no error on the command line.

However my output file looks like this

Bad option -c.

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
            [-r count] [-s count] [[-j host-list] | [-k host-list]]
            [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name
0
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 40421517
Your ping command does not support the "-c" flag. Which is your OS? HPUX?
It seems that you'll have to use "-n" instead:

ping -n 1 $i >> output.txt 2>>errors.txt
0
 

Author Comment

by:tjoconnor
ID: 40421540
Hi

Yes I used -n 3 $I>>..... and it worked

Thanks a million for your help today guys, really appreciated it
0
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 40421585
You're always welcome!
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

How to remove superseded packages in windows w60 or w61 installation media (.wim) or online system to prevent unnecessary space. w60 means Windows Vista or Windows Server 2008. w61 means Windows 7 or Windows Server 2008 R2. There are various …
I. Introduction There's an interesting discussion going on now in an Experts Exchange Group — Attachments with no extension (http://www.experts-exchange.com/discussions/210281/Attachments-with-no-extension.html). This reminded me of questions tha…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…

896 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now