How to check if ssh-agent is already running in bash

PID_SSH_AGENT=`eval ssh-agent -s | grep -Po "(?<=pid\ ).*(?=\;)"`

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Tadc 100 points

                                    if [ $(ps ax | grep [s]sh-agent | wc -l) -gt 0 ] ; then
    echo &quot;ssh-agent is already running&quot;
else
    eval $(ssh-agent -s)
    if [ &quot;$(ssh-add -l)&quot; == &quot;The agent has no identities.&quot; ] ; then
        ssh-add ~/.ssh/id_rsa
    fi

    # Don't leave extra agents around: kill it on exit. You may not want this part.
    trap &quot;ssh-agent -k&quot; exit
fi

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