I store in a file named ssh_hosts.txt a list of hostnames. In a shell script, I loop over the hostnames in ssh_hosts.txt and execute a command on the named host via SSH. The shell script is shown below.
The problem is that the script exits after processing the first host. But if I do something other than execute a command on the named host via ssh, the script will run to completion.
In the example below, I've commented out the call to ssh and replaced it with a simple echo of the current host name. This will run to completion.
I am executing this script from a bash shell running under the following Cygwin version on Windows 7:
$ uname -a CYGWIN_NT-6.1 myHostname 1.7.16(0.262/5/3) 2012-07-20 22:55 i686 Cygwin
These SSH versions are involved:
$ ssh -V OpenSSH_6.0p1, OpenSSL 1.0.1c 10 May 2012 $ ssh myUsername@remoteHost 'ssh -V' myUsername@remoteHost password: OpenSSH_6.7p1 Debian-5+deb8u3, OpenSSL 1.0.1t 3 May 2016
Here is the shell script:
#!/bin/bash if [[ $# -ne 1 ]]; then echo "Usage: $(basename $0) <user name>" exit 1 fi USER="$1" while IFS='' read -r ssh_host || [[ -n "$ssh_host" ]]; do # This line will execute for all hosts listed in ssh_hosts.txt. echo $ssh_host # This line will execute for *only the first* host in ssh_hosts.txt. # ssh $USER@$ssh_host 'echo $(whoami)@$(hostname)' done < ssh_hosts.txt
How may I get this shell script to execute over all hosts in ssh_hosts.txt rather than just over the first host?