切换用户后，Shell脚本会自动从SSH部分退出（通过pbrun命令）

Question

I have the below piece of code..

ssh some_user@server << EOF
echo 'Successfully connected to the server'
pbrun previlige -u user
ls
pwd
id
...few more commands
EOF
if [ $? -eq 0 ]
then
     echo 'Successful Execution of the last command in ssh'
fi

Now the issue that I face in the above code is, the script automatically exits after switching user through the pbrun command (ie it never executes the ls , pwd and subsequent commands). To make things complicated, this issue is intermittent. Sometimes I get the proper output of all the subsequent commands and sometimes I don't.

Output when the issue occurs:

Successfully connected to the server 
su from some_user to user at Mon Oct 6 09:47:00  MDT 2014 
Successful Execution of the last command in ssh

In the above case it never displays the subsequent output of commands after switching the user

Output when the issue doesn't occur

Successfully connected to the server 
su from some_user to user at Mon Oct 6 09:47:00 MDT 2014 
Logs migrate.properties prereq.sh src_exp.sh src_mig.exp 
/home/venus/ 
uid=* gid=* groups=**** 
Successful Execution of the last command in ssh

Is there any cause/fix for this? Even a workaround should be fine for me..! Thanks!

Answer 1

Passing an inner heredoc ensures that your later contents are fed to pbrun 's stdin, rather than invoked in the outer shell only after pbrun exits, which is what would happen otherwise:

ssh some_user@server <<'OUTER_EOF'
echo 'Successfully connected to the server'
pbrun -u user bash <<'INNER_EOF'
# this is inside both ssh and pbrun
ls
pwd
id
INNER_EOF
# this is inside ssh, but not inside pbrun
OUTER_EOF