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for H in `ps auxwwwwf | grep httpd | awk '{print sum +=$6 }' | tail -1` ;do echo $H /1024 | echo `bc`MB ;done
[[email protected] ~]$ for H in `ps auxwwwwf | grep httpd | awk '{print sum +=$6 }' | tail -1` ;do echo $H /1024 | echo `bc`MB ;done 587MB