SSH AUTH SOCK setter

start-ssh-agent.sh

# ~/bin/start-ssh-agent.sh
# make sure your .bashrc sources this file, I use:
#
# if [ -t ]
# then
#     . ~/bin/start-ssh-agent.sh
# fi
#
# Old versions of SSH used to call the variable
# SSH_AUTHORIZATION_SOCKET; this is no longer supported.

if [ "$1" = "-q" ]
then
	RC=1
	shift
fi

PATTERN=$1
[ -z "$PATTERN" ] && PATTERN=:

OLD_SSH_AUTH_SOCK="$SSH_AUTH_SOCK"
SSH_AUTH_SOCK=

if [ -d "`ls -d /tmp/ssh-* 2>/dev/null | head -1`" ]
then
    for x in "$OLD_SSH_AUTH_SOCK" /tmp/ssh-*/*
    do
	#echo -n Checking $x ...
	[ -S $x ] || continue #( echo not a socket, ignoring; continue )
	export SSH_AUTH_SOCK=$x
	if [ -n "`ssh-add -l 2>/dev/null | grep \"$PATTERN\"`" ]
	then
	    #echo that\'ll do!
	    found="$x"
            break
	#else
	    #echo no relevant identities, next!
	fi
    done
    if [ -z "$found" ]
    then
        for x in "$OLD_SSH_AUTH_SOCK" /tmp/ssh-*/*
        do
	    #echo -n Checking $x ...
	    [ -S $x ] || continue #( echo not a socket, ignoring; continue )
	    export SSH_AUTH_SOCK=$x
	    if [ -n "$(ssh-add -l 2>&1 | grep -i 'no identities')" ]
	    then
	         found="$x"
 		 break
	    fi
        done
    fi
fi

if [ -z "$SSH_AUTH_SOCK" ]
then
    #echo Starting a new agent, as \$SSH_AUTH_SOCK is \""$SSH_AUTH_SOCK"\"
    eval $(ssh-agent -s 2>/dev/null)
fi

export SSH_AUTH_SOCK SSH_AGENT_PID

if [ -z "$RC" ]
then
	echo "SSH_AUTH_SOCK is $SSH_AUTH_SOCK"
	ssh-add -l
fi