3 Comments on “Which environment variables are used by ssh-agent?”

1. Ronaldo SB says:

   January 23, 2015 at 10:32 pm

   This brings SSH_AUTH_SOCK and SSH_AGENT_PID as environment variables into the current shell.

   
   
   
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2. joe says:

   February 22, 2015 at 8:04 pm

   Correct:

   C, D

   
   
   
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3. Ektoras says:

   March 19, 2015 at 2:40 pm

   Ronaldo and Joe are correct, here i post an example of the enviroment variable

   # set environment variables if user’s agent already exists
   SSH_AUTH_SOCK=$(ls -l /tmp/ssh-*/agent.* 2> /dev/null | grep $(whoami) | awk ‘{print $9}’)
   SSH_AGENT_PID=$(echo $SSH_AUTH_SOCK | cut -d. -f2)
   [ -n “$SSH_AUTH_SOCK” ] && export SSH_AUTH_SOCK
   [ -n “$SSH_AGENT_PID” ] && export SSH_AGENT_PID

   # start agent if necessary
   if [ -z $SSH_AGENT_PID ] && [ -z $SSH_TTY ]; then # if no agent & not in ssh
   eval `ssh-agent -s` > /dev/null
   fi

   # setup addition of keys when needed
   if [ -z “$SSH_TTY” ] ; then # if not using ssh
   ssh-add -l > /dev/null # check for keys
   if [ $? -ne 0 ] ; then
   alias ssh=’ssh-add -l > /dev/null || ssh-add && unalias ssh ; ssh’
   if [ -f “/usr/lib/ssh/x11-ssh-askpass” ] ; then
   SSH_ASKPASS=”/usr/lib/ssh/x11-ssh-askpass” ; export SSH_ASKPASS
   fi
   fi
   fi

   
   
   
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