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 stating a specific condition...
hello all,

can someone help me with specifying a condition within an 'if' statement...

since i'm new to this, i'm not really sure if this is possible.

what i am doing is writing a little script to ping ip addresses contained within
a list called ip.txt.  upon being ping'd i want to state a condition where if
the output contains the word "alive" in it, then it should go to a file called
alive.txt.  anything other than that should go to a file called dead.txt.

i wrote something like this:

iplist = `cat ip.txt`
for i in $iplist
/usr/sbin/ping $i 1
if [ $1 = "$i is alive" ]; then
echo $1 >> alive.txt
echo $1 >> dead.txt

as you pros out there will know, the above doesn't quite work the way it is
supposed to.  any help would be greatly appreciated.

to add, i was wondering... is there a way to send output to a file specifying
the condition of a date it has to match with?

for example, if i wanted to run my completed script everyday, every 5 hours for
a week - mon to sun, could i let the output append to the monday file... but the
moment it turned tuesday, a new tuesday file would be created which would append
until it was wednesday, from which another new wednesday file is created... and
so on...

in turn, i would get 14 scripts...  7 days alive.txt and 8 days dead.txt


 Sat, 11 Oct 2003 22:10:18 GMT   
 stating a specific condition...

"$1" is the first argument given to the script when you execute it:

Example% scriptname first_argument second_argument

Within the script, $1's value will be "first_argument". $2's value will be

What you want to compare is the exit code of ping. Within a shell, the exit
code of the just-finished command is accessed by $?. A value of 0 indicates a
success, and non-zero means a failure of some sort. Some commands use the exit
codes to indicate the failure. So one way to go about it could look like this:

/usr/bin/ping $i 1
if [ "$?" = "0" ] ; then
echo "$i is alive." >> alive.txt

A more elegant solution:

if /usr/bin/ping $i 1 ; then

 Sat, 11 Oct 2003 22:52:46 GMT   
 stating a specific condition...
Thanks for the input Mathew.

I modified it based on the exit code of the ping and it worked fine.

Just wanted to know if you had any advice as to my second question regarding
appending to a specific file based on the date, and then creating and appending
to a new file when the date changes.


In article <>, Mathew Kirsch says...

 Sun, 12 Oct 2003 01:08:40 GMT   
 stating a specific condition...

"goku" <>

How about


for ip in `cat iplist`
        if /bin/ping -c 1 ${ip} 1> /dev/null 2>&1; then
                echo "${ip}" >> ip.`date +%Y%m%d`.good
                echo "${ip}" >> ip.`date +%Y%m%d`.bad

 Sun, 12 Oct 2003 04:01:41 GMT   
 stating a specific condition...
Hi Phineas!

Just wanted to thank you for the advice regarding the script.  It worked like a



In article <>, Phineas T.
Barnham says...

 Sat, 18 Oct 2003 22:52:37 GMT   
 stating a specific condition...

"goku" <>


 Sun, 19 Oct 2003 01:47:13 GMT   
   [ 6 post ] 

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