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How to check if ssh-agent is already running in bash Code Example
How to check if ssh-agent is already running in bash 
PID_SSH_AGENT=`eval ssh-agent -s | grep -Po "(?<=pid\ ).*(?=\;)"`
Source: stackoverflow.com
How to check if ssh-agent is already running in bash 
if [ $(ps ax | grep [s]sh-agent | wc -l) -gt 0 ] ; then
    echo "ssh-agent is already running"
else
    eval $(ssh-agent -s)
    if [ "$(ssh-add -l)" == "The agent has no identities." ] ; then
        ssh-add ~/.ssh/id_rsa
    fi

    # Don't leave extra agents around: kill it on exit. You may not want this part.
    trap "ssh-agent -k" exit
fi
Source: stackoverflow.com



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