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linux shell »ù±¾ÃüÁî

1.²»Ìáʾɾ³ýĿ¼  rm -rf ${dir}
2.rpm ²é¿´²¢Ð¶ÔØÈí¼þ
  rpm -qa | grep ${appname}
  rpm -e ${rpmname}
3.Êýѧ¼ÆËãÖ®bc
  echo "3 + 4 - 5 * 5 - 7 " | bc
 echo "3 + 4 - 5 * 5 - 7 " | bc | read myresult
4.²é¿´½ø³Ì
  ps -ef £ü grep ${tname}
exp: ......
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