$SSH_CLIENT has IP address with some port info, and echo $SSH_CLIENT gives me '10.0.40.177 52335 22', and Running
if [ -n "$SSH_CONNECTION" ] ; then for i in $SSH_CLIENT do echo $i done fi
gives me
And I see the first element is the IP address.
Q : How can I get the first element of $SSH_CLIENT? ${SSH_CLIENT[0]} doesn't work.
sshvars=($SSH_CLIENT) echo "${sshvars[0]}" or:
echo "${SSH_CLIENT%% *}" 
echo ${SSH_CLIENT// *}you can use set -- eg
$ SSH_CLIENT="10.0.40.177 52335 22" $ set -- $SSH_CLIENT $ echo $1 # first "element" 10.0.40.177 $ echo $2 # second "element" 52335 $ echo $3 22 For strings, as is the case here, the <<< operator may be used:
$ read ipaddress outport inport <<< $SSH_CLIENT See e.g: Linux Bash: Multiple variable assignment. Don't do this with binary input though: Is there a binary safe <<< in bash?
$(echo ...), it's the same as just including the variable.
If you prefer awk:
$ SSH_CLIENT="10.0.40.177 52335 22" $ echo $SSH_CLIENT|awk '{print $1}' # first element 10.0.40.177 $ echo $SSH_CLIENT|awk '{print $2}' # second element 52335 $ echo $SSH_CLIENT|awk '{print $3}' # third element 22 I use this in my .bash_profile, and it works beautifully.
if [ -n "$SSH_CONNECTION" ] ; then echo $SSH_CLIENT | awk '{print $1}' fi You can get it programmatic way via ssh library (https://code.google.com/p/sshxcute)
public static String getIpAddress() throws TaskExecFailException{ ConnBean cb = new ConnBean(host, username, password); SSHExec ssh = SSHExec.getInstance(cb); ssh.connect(); CustomTask sampleTask = new ExecCommand("echo \"${SSH_CLIENT%% *}\""); String Result = ssh.exec(sampleTask).sysout; ssh.disconnect(); return Result; } 