enable/disable SSH X11 forwarding

bash_x11_fwd_enable_disable.sh

#!/bin/bash

SSHD_CONFIG=/etc/ssh/sshd_config
SSH_SVC=/etc/init.d/sshd

v=`grep -m 1 -e "X11Forwarding" ${SSHD_CONFIG} | awk '{ if( $0 ~ /^#/ ) print "no"; else print $2; }'`

enabled=0;

if [ ${v} == 'yes' ]; then
        enabled=1;
fi

case "$1" in
  enable)
        if [ ${enabled} -eq 0 ]; then
                sed -i 's/[#]*X11Forwarding[ ]*[a-z]*/X11Forwarding yes/' ${SSHD_CONFIG}
                ${SSH_SVC} restart
        else
                echo "already enabled"
        fi
        ;;
  disable)
        if [ ${enabled} -ne 0 ]; then
                sed -i 's/[#]*X11Forwarding[ ]*[a-z]*/X11Forwarding no/' ${SSHD_CONFIG}
                ${SSH_SVC} restart
        else
                echo "already disabled"
        fi
        ;;
  *)
        echo "unrecognized option"
        exit 2
        ;;
esac

exit $?