topic Re: Shell programing in Operating System - HP-UX

Shell programing

Igor Sovin — Tue, 28 Mar 2006 05:39:19 GMT

I have text file with several strings in it.
for example
more 123.txt
aa
bb
cc
dd

I need to make script that could read these strings from 123.txt and write them in another txt file.

Re: Shell programing

RAC_1 — Tue, 28 Mar 2006 05:40:57 GMT

cp 123.txt what_ever.txt

Re: Shell programing

Muthukumar_5 — Tue, 28 Mar 2006 05:48:16 GMT

while read line; do

echo ${line}

done < inputfile >

You can copy all the contents if you are not going to any changes as,

cp

--
Muthu

Re: Shell programing

Peter Godron — Tue, 28 Mar 2006 05:49:46 GMT

Igor,
if you insists on a script:
#!/usr/bin/sh
while read record
do
echo $record >> output.txt
done < 123.txt

Re: Shell programing

Muthukumar_5 — Tue, 28 Mar 2006 05:53:00 GMT

Are you going to do any shell program or changes in content? or simply that contents itself?!

More ways to simply copy the file contents to new.

cat file > newfile

--
Muthu

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 05:53:34 GMT

I have the following script:

for i in 1 2 3
do
command ${variable}
done

I need to get aa then bb and cc from 123.txt and put it into my script instead of variable.
How to do that?

Re: Shell programing

Muthukumar_5 — Tue, 28 Mar 2006 06:00:38 GMT

Use like:

for i in 1 2 3
do
while read variable;
do
command ${variable}
done < 123.txt
done

That is it.

--
Muthu

Re: Shell programing

Muthukumar_5 — Tue, 28 Mar 2006 06:03:19 GMT

Can you just ellaborate your requirement to give effect script solution!? In the for loop you are not using i variable anywhere.

Post requirement as:

1) input
2) expected output from input

--
Muthu

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 06:20:40 GMT

the problem is :

1. I have txt file containing list of remote hosts.
host1
host2
host3 etc
2. I need to do script that reads host1 from txt file and ssh to host1 do the command then exit from host1, and this action must be done for all hosts ( host2, host3.. etc).

Re: Shell programing

Muthukumar_5 — Tue, 28 Mar 2006 06:25:57 GMT

1. I have txt file containing list of remote hosts.
host1
host2
host3 etc
2. I need to do script that reads host1 from txt file and ssh to host1 do the command then exit from host1, and this action must be done for all hosts ( host2, host3.. etc).

>>>>>>>>

Simply as,

put all hosts in > hosts file. So host1,host2 and etc are in hosts file.

while read host;
do
ssh @${host} 'command'
done < hosts

If you don't want to specify the hostname then,

while read host;
do
ssh ${host} 'command'
done < hosts

will do that.

PS: Hope you have set key transaction between hosts for not asking password. Else it will ask password.

--
Muthu

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 06:30:09 GMT

let me try..

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 09:52:18 GMT

I've created two files

root@lev /Ignite_Bckp>more test.sh
while read host;
do
ssh ${host}
done < hosts_test.txt

and file containing hosts (in the same dir)

root@lev /Ignite_Bckp>more hosts_test.txt
adam
kate

when executing script test.sh I get error:

root@lev /Ignite_Bckp>chmod +x hosts_test.txt
root@lev /Ignite_Bckp>./hosts_test.txt
./hosts_test.txt: adam: not found.
./hosts_test.txt[2]: kate: not found.

Re: Shell programing

Hein van den Heuvel — Tue, 28 Mar 2006 10:13:36 GMT

You reversed the files and are trying to exectue the data (.txt) file.

Try:

chmod +x test.sh
./test.sh

Also... I generally preferr to keep the parameter out of the script file. You your case that means removing the "< node_test.txt" fromt eh .sh

The activate the shell script providing whatever data is appropirate at the moment, possibly even entering lines manually:

./test.sh < node_test.txt

Hein.

Re: Shell programing

Peter Nikitka — Tue, 28 Mar 2006 10:35:21 GMT

Hi,

a simple 'ssh' will leave stdin open, so a successful connection will read all but the first value of the loop.
Use:

while read host
do ssh -n $host
done

mfG Peter

Re: Shell programing

Patrice Le Guyader — Tue, 28 Mar 2006 10:40:16 GMT

Demat,

Try to enable the public key mechanism.

Look at this procedure and check for the following lines in sshd.conf file :
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile ~/.ssh/authorized_keys
These lines should be uncommented.

After this you'll be able to do : sftp/scp/ssh between this hosts without password asking.

Another possibility for shell scripting ;
#!/sbin/sh
for SERVER in `cat hosts.txt`
do
ssh $SERVER < command 1
command 2
command n
EOF
done

Hope this help
Kenavo
Pat

Re: Shell programing

Jannik — Tue, 28 Mar 2006 13:37:39 GMT

#!/usr/bin/ksh
# use file /tmp/host.list
# file name is : xxxxx

for i in $(cat /tmp/host.list)
do
echo "do something on : $i"
ssh root@$i "command;command"
done

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 21:13:25 GMT

I'm a novice in shell programming.
Thanks to all for advices. My scrips works fine now.

Re: Shell programing

Arunvijai_4 — Tue, 28 Mar 2006 22:14:34 GMT

Hi Igor,

You can close this thread now.

-Arun

Re: Shell programing

Igor Sovin — Tue, 28 Mar 2006 22:17:44 GMT

have found a solution to this question as seen in the comments below.