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Use this code snippet to automatically check whether the VOMS proxy needs to be prolonged:
if [[ $(voms-proxy-info --timeleft) < 18000 ]]; then # 5 hours echo '>>> voms-proxy-init -voms cms -valid 200:0' voms-proxy-init -voms cms -valid 200:0 else echo ">>> voms still valid for another `date -u -d @$(voms-proxy-info --timeleft) +"%-d days %-H hours %-M minutes"`" fi