Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

ssh breaks loop

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting ssh breaks loop
# 1  
Old 07-13-2011
ssh breaks loop
Here is the smallest extract to demonstrate the problem that I experience.
Code:
#!/bin/bash

r=$1

while read ip
do
	if [[ $r = "" ]] ;then	
		x=`ssh $ip echo "$ip"`
	else
		x=`echo "$ip"`
	fi
	echo $x
done << EOF
192.168.8.241
192.168.8.241
EOF
# Any IP with public key set

This loop is executed once, If called with echo executed remotely, without ssh everything is OK. Somehow ssh breaks standard input. Doesn't matter whether it is here-doc or a regular file. There are plenty of workarounds but why this snippet behaves as it does?

Thanks

---------- Post updated 07-13-11 at 12:37 PM ---------- Previous update was 07-12-11 at 10:20 PM ----------

Figured it out: ssh -n does the trick
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Unable to loop with ssh

I read a file (iplist.txt) ine-by-line in a loop which has the list of all the server hostnames. With each hostname read; I do ssh and fire multiple commands to gather information about that systemas shown below. #!/bin/bash while IFS='' read -r line || ]; do echo "Text read from file:... (3 Replies)
Discussion started by: mohtashims
3 Replies

2. UNIX for Dummies Questions & Answers

Page breaks and line breaks

Hi All, Need an urgent solution to an issue . We have created a ksh file or shell script which generates 1 DAT file. the DAT file contains extract of a select statement . Now the issue is , when we are executing the ksh file , the output is coimng with page breaks and line breaks . We have... (4 Replies)
Discussion started by: Ayaskant
4 Replies

3. AIX

Need help on for loop inside ssh

Hi, I am having a file like, #cat file Jun 19 13:08 Jun 19 13:08 Jun 19 13:08 Jun 19 13:14 when I run the below comamnd locally it will work fine, IFS=$'\n'; for i in $(cat file) ;do echo "HI $i" ; done And the output is, HI Jun 19 13:08 HI Jun 19 13:08 HI Jun 19 13:08 HI... (1 Reply)
Discussion started by: sumanthupar
1 Replies

4. AIX

Loop breaks through ssh in script

hello all, i have an AIX6.1 machine and INFORMIX 11.7 database server. i have a script to create users on 3 machines and also i need to grant this user access to a specific database. the script works and it does what i want it to do but the loop doesnt work. for example if i insert 10 lines in... (5 Replies)
Discussion started by: omonoiatis9
5 Replies

5. Shell Programming and Scripting

ksh while read loop breaks after one record - AIX

#!/bin/ksh for SRV in imawasp01 \ imawasp02 \ imawasp03 \ imawasp04 \ imawasp05 \ imawasp06 \ imawasp07 \ imawasp08 \ imawasp09 do print "${SRV}" while read PASSLINE do SRVNAME=`echo ${PASSLINE} | awk -F\: '{print $1}'` LASTLOGIN=`ssh ${SRV} lsuser ${SRVNAME} | tr '... (2 Replies)
Discussion started by: port43
2 Replies

6. Shell Programming and Scripting

Loop breaks on yes/no user input

I have a shell script, and its pretty much done, I decided to add a loop that ends or continues depending on user input. like "would you like to continue?" and if I hit y or yes it will run the loop again until I hit n or no and breaks out of the loop. To be hones I didn't think I needed to add... (2 Replies)
Discussion started by: Demon_Jester
2 Replies

7. UNIX for Dummies Questions & Answers

ssh and for loop

Hi all, I am facing an issue while trying to access a for loop variable inside ssh. Can anyone please help me with what this issue is, the following is the code that I have -> IMPL_LOG_FOLDERS=(transaction_logs invalid_transaction_logs) sshg3 ftp_id@boxname << EOS for log_folder in... (5 Replies)
Discussion started by: anindyabecs
5 Replies

8. Shell Programming and Scripting

using ssh with a for loop

How do you do an ssh on a for statement. I have done ssh on individula lines of code before with no problems. #!/usr/bin/ksh cat server_list.txt | while read line do ssh $line "for i in `lslpp -l |grep tsm` do lslpp -Lc $i |grep -v State |tr ':' ',' |awk -F, '{print $2, "," ,... (4 Replies)
Discussion started by: din
4 Replies

9. Shell Programming and Scripting

ssh and executing a for loop

Hi all, I am trying to run a script which is expected to do: on the remote machine, There are two directories /export/home/abc1,/export/home/abc2 i am trying to do, ssh SERVERNAME "for i in `ls -l /export/home/abc*|awk '{print $9}'`; do cd $i; ls -l; done" But its not working ,iam... (11 Replies)
Discussion started by: Jartan
11 Replies

10. Shell Programming and Scripting

Pb in while loop with ssh command

Hi I use the following command to check if my_base is active or not : active_db=`${LOCAL_BIN}/ssh -l ${my_user} ${my_service} "ps -ef | grep ora_smon | grep ${my_base} | sed -e \"s/ */ /g\" | cut -d'?' -f2 | cut -d' ' -f3 | cut -d'_' -f3"` When I use a file listing databases to check them... (1 Reply)
Discussion started by: madmat
1 Replies
Login or Register to Ask a Question

LEARN ABOUT REDHAT

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for hostbased authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during hostbased authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the the global client configuration file /etc/ssh/ssh_config by setting
     HostbasedAuthentication to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about hostbased authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if hostbased
	     authentication is used.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

AUTHORS

     Markus Friedl <markus@openbsd.org>

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

BSD
								   May 24, 2002 							       BSD