unix에서 날짜찍기

 echo `date '+%y%m%d'`
-> 060728

echo `date '+%Y%m%d'`
-> 20060728

echo `date '+%Y%m%d_%H%M%S'`
-> 20060728_170000

 

echo `date +"%Y%m%d%H%M%S"`

echo `date +%Y%m%d --date '1 day ago'`