Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Executing remote commands via ssh

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Executing remote commands via ssh
# 1  
Old 07-22-2012
Question Executing remote commands via ssh
Hi,
I'm tryin to write a script that will collect information about a remote servers, put them into variables and print them to screen.

Code:
# /usr/bin/bash
ls $1 > /dev/null 2>/dev/null
if [ "$?" -eq 0 ]
then
  echo "$1 is file"
        for server in $(cat $1)
        do
#       echo $server
                ssh -T $server /bin/bash -s <<EOF
                HOST1=$(hostname)     #1
                `hostname`       #2
EOF
echo $HOST1
        done
else
 echo "$1 is not file"

#ssh $1
fi

the output of the 1st variable is nothing,
and the output of the command is the name of the local machine.

thanks a lot.
Last edited by moshesa; 07-22-2012 at 11:05 AM..
# 2  
Old 07-22-2012
That seems somewhat convoluted.

Code:
if [ -f "$1" ]; then
  while read SERVER; do
    HOST1=$(ssh -T $SERVER "\$(hostname)")
    echo $HOST1
  done < "$1"
else
  echo "File not found"
fi

# 3  
Old 07-22-2012
OK thanks, it's a kind of solution. but, if I want to take a lot of information and put that in variables (like: mem_usage, CPU, and more) i don't want to do more than one SSH connection per server.
I prefer to do that with one SSH connection and EOF.

tnx again.
# 4  
Old 07-22-2012
Use a here-document like <<"EOF", which will not evaluate the contents locally.
This User Gave Thanks to Corona688 For This Post:
Chirel
# 5  
Old 07-22-2012
I did not understand..
Can you explain?
# 6  
Old 07-22-2012
You could always try it and see...

Code:
$ cat <<EOF
`echo asdf`
EOF

asdf

$ cat <<"EOF"
`echo asdf`
EOF

`echo asdf`

$

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Remote script via SSH not executing

I have worked on multiple scenarios to execute remote script via ssh. This problem I am not able to resolve. 2 linux hosts. Server1, Server2 on Server1 I have script called ~/scripts/start_standalone.sh XXXX cd $JBOSS_HOME NODENAME=xyz; IP_ADDR=`hostname`; MGMT_IPADDR=`hostname`;... (3 Replies)
Discussion started by: oraclermanpt
3 Replies

2. Shell Programming and Scripting

Issue in executing cat (remote ssh)

Hi, I need to ssh remotely to a machine and cat a file assign the value to a variable Script: #!/bin/bash -x value=`cat config.txt` echo "$value" ssh me@xxx.host.com "valu='cat /export/home/test.md5'; echo "$valu"" | tee Execution: $ ./x ++ cat config.txt + value='touch me' +... (5 Replies)
Discussion started by: close2jay
5 Replies

3. Linux

Executing a script in remote machine through ssh

How to execute a script in remote machine through ssh I have a script test.sh which does some backup activity in remote machine. Wanted to keep backup also in remote machine. ssh -l username <remote machine> "commands to be exceuted as ; separted" but how to put the script in the place of... (5 Replies)
Discussion started by: sanvel
5 Replies

4. Shell Programming and Scripting

Executing multiple ssh commands inside a shell simultaneously

I would like to execute a commands in four different servers through ssh at a single instance(simultaneously). Below are the details with examples, ssh user1@server1 "grep xxxx logs" ssh user1@server2 "grep xxxx logs" ssh user1@server3 "grep xxxx logs" Each statement will take some... (4 Replies)
Discussion started by: Amutha
4 Replies

5. Shell Programming and Scripting

executing commands in remote server using ssh

I have some commands which need to be executed in remote machine. I have Linux Server from where I need to connect to Solaris server using ssh and then declare some variable over there and run some commands. I don't want to call a script which is present in Solaris server from Linux server... (7 Replies)
Discussion started by: maitree
7 Replies

6. Shell Programming and Scripting

Need help with executing multiple commands in remote machine

Hi, I work on a jumpserver and I wrote a script to transfer a file from source server to destination server. #!/bin/ksh echo "\nEnter the file name:\n" read name echo "\nSelect the Source server\n" echo "1. ODS PROD " echo "2. ODS DROPBOX" echo "3. ODS STE" echo "4. ODS STE DROPBOX"... (6 Replies)
Discussion started by: ajayakunuri
6 Replies

7. UNIX for Dummies Questions & Answers

how to stay in remote shell after executing commands in ssh?

the ssh calling convention: ssh <server> If I put commands in the section, ssh will execute them immediately after logging in and return to local shell. I want to stay in the remote shell after executing these commands. How can I achieve this? Thanks for all. (1 Reply)
Discussion started by: hplonlien
1 Replies

8. Shell Programming and Scripting

executing commands over ssh

Hi I am trying to send a command over ssh with a parameter but the shell fails to expand the command properly any ideas what am i doing wrong with this. This is ssh on AIX for i in 71 72 73 74 75 do for server in server1 server2 do somestr="Some String" echo "$server... (3 Replies)
Discussion started by: xiamin
3 Replies

9. Shell Programming and Scripting

Executing a script on a remote system via SSH

Hello all, I have a relatively simple script I wrote to generate a count of errors broken down. What I would like to do is execute this script from another server so that I don't actually have to log in to the server to run the check. The script on what we'll call "Server A" is: ... (2 Replies)
Discussion started by: DeCoTwc
2 Replies

10. Shell Programming and Scripting

Executing awk in a remote server using ssh

Hello Everybody, I'm facing a weird problem with the awk command. I'm trying to execute a simple awk command as follows, echo 1 2 | awk '{print $2}' This command prints the output 2. When i try to execute the same command in a remote server using ssh as follows, ssh user@host... (2 Replies)
Discussion started by: karthikv
2 Replies
Login or Register to Ask a Question