xianlaianliyibo: grep (global search regular expression(re) and print out the line,quanmiansousuozhengzebiaodashibingbaxingdayinchulai)shiyizhongqiangdadewenbensousuogongju,tanengshiyongzhengzebiaodashisousuowenben,bingbapipeidexingdayinchulai。 unixdegrepjiazubaokuogrep、egrephefgrep。egrephefgrepdeming...