CODEWITHSUNDEEP
linuxunixsshbash-trap
Deepak
Deepak

Reputation: 43

Sending Ctrl_C over ssh

On many of my servers autofs is hung and a process is trying to access a mount, and while I ssh to the remote host the it hangs there until I press Crtl+C from my keyboard

dew:~ # ssh  dew00922

but when I press Crtl+C its goes to the prompt

dew:~ # ssh  dew00922
^C-bash-3.2#
-bash-3.2#

I'm trying to send trap signal via the ssh but that also hangs

dew:~ # ssh  dew00922 'trap 2 && service autofs restart'

Any help in fixing this issue.

Upvotes: 0

Views: 678

Answers (2)

Daniel Alder
Daniel Alder

Reputation: 5372

timeout is the tool made for such problems:

ssh  dew00922 'timeout 2 service autofs restart'

See man timeout for more information

Upvotes: 0

rob mayoff
rob mayoff

Reputation: 385660

When you ssh in, it's trying to run /etc/profile and then ~root/.profile (or ~root/.bash_profile or ~root/.bash_login) and ~root/.bashrc. One of those scripts runs a command that is trying to access a hung filesystem. When you press ^ C, you're killing the script and getting a prompt from the bash on dew0922. At that point you are logged into dew00922 and can run commands. Any commands you run that try to access a hung filesystem will hang.

Upvotes: 2

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