I need to speed up this process. I would like for this script to spawn a sub-process for each line it reads and move on to the next without waiting for the data to be returned.
I know with a large list this can be dangerous and eat system resources. However I use this script only when I get a large outage and I need to verify if it is the tools having a hiccup or if sites are truly down. Ignore the remarked out lines, I have a manual process for getting a clean file, I just left that code there for my own reference. The part in red is what I want to run as sub processes for each line in the file. In short open up a instance of ping for each host name.
Forgive any style errors as I am fairly new to scripting
Code:
#!/bin/bash#reads input from the keyboard to populate variable "filename"
echo 'Enter file name:'
read filename
#Reads the file line by line and prints the third field which is the device name.
#Device names are saved to the file convert.txt then the entire file is moved back to the orginal file
#Leaving a clean file of just device names
# cat $filename | awk '{print $3}' >>convert.txt && mv convert.txt $filename#Reads the device names from the now clean file one line at a time and stores the device name as variable "ipaddr"
for ipaddr in `cat $filename`;
#This loop will ping each device name and print out on the screen is the device is up or down
do
count=$(ping -c4 $ipaddr | grep received | awk -F',' '{ print $2 }' | awk '{ print $1 }')
if [ $count -eq 0 ]; then
echo "Host : $ipaddr is down (ping failed) at $(date)"
else echo "Host : $ipaddr is up"
fi
done;
Moderator's Comments:
Please use code tags, thank you
Last edited by Franklin52; 09-17-2010 at 04:04 AM..
Just a super quick question:
how do you put a link in your php code.
I want to make a link to something in /tmp directory.
i.e. how do you put a href into php, I think it's done a bit differently.
thanks
john (1 Reply)
Hi, I am new to UNIX, and am learning from this tutorial : http://www.ee.surrey.ac.uk/Teaching/Unix/index.html
It keeps telling me to files downloaded from the internet (like .txt files) to the directory, and I dont know how to.
How do I add .txt files to my directory? Thanks. (6 Replies)
Hi,
At best I'm a junior admin with a big problem.
My developers have got my root password and mgmt insists they need it.
I can't even change it when people knowing it leave.
I'm certain they've hardcoded it into routines. I've searched my servers and grepped everything & can't find it.
... (5 Replies)
I'm in .profile. I want to export a directory ( export MY_TOOL_HOME=/tools/my tool". Unfortunately for me, the directory I want to export to has a space in its name. So when I try to cd $MY_TOOL_HOME, i get a No such file or directory at the command line... thanks for the help (4 Replies)
When I have a file like this:
0084AF aj-123-a NAME Ajay NAME Kumar Engineer
015ED6 ck-345-c
020B25 ef-456-e
027458 pq-890-p NAME Peter NAME Salob Doctor
0318F0 xy-123-x NAME Xavier Arul NAME Yesu Supervisor
0344CA de-456-d
where - The first NAME is followed by... (6 Replies)
Hi guys
Quick question
Im creating an FTP server and im chrooting each user to there home directory blah blah. Ive also setup scponly so there locked etc.
Im a novice at unix and have just reaslised the primary group of scponly is the username of one of the ftp users... which im sure... (1 Reply)
Hello,
I have a quick reference question:
I have a very long, but fairly straigtforward script written in c-shell. I was wondering if it is possible to call this script from bash (for ex. having a function in bash script which calls the c-shell script when necessary), and if so, are there any... (1 Reply)
Hi,
I'm basically looking to see what this line of code does:
. `dirname $0`/../config/config
Thanks. (1 Reply)
Discussion started by: cabaiste
1 Replies
LEARN ABOUT OPENSOLARIS
libbash
LIBBASH(7) libbash Manual LIBBASH(7)NAME
libbash -- A bash shared libraries package.
DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
want to load and use in scripts of your own.
It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.
Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded
using
ldbash(1) must answer 4 requirments:
1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).
2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library
exports. I.e. all the function that will be usable after loading that library will be listed in that line.
3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are
required for our library. I.e. every bash library that is in use in our bash library must be listed there.
4. The library must be listed (For more information, see ldbashconfig(8)).
Basic guidelines for writing library of your own:
1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.
2. Try to declare all variables intended for internal use as local.
3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
__<library_name>_
For example, internal function myfoosort of hashstash library should be named as
__hashstash_myfoosort
This helps to avoid conflicts in global name space when using libraries that come from different vendors.
4. See html manual for full version of this guide.
AUTHORS
Hai Zaar <haizaar@haizaar.com>
Gil Ran <ril@ran4.net>
SEE ALSO ldbash(1), ldbashconfig(8), getopts(1), hashstash(1)colors(1)messages(1)urlcoding(1)locks(1)Linux Epoch Linux
09-17-2010
