创建:文件的创建:# touch file #无则创建,有则修改时间 # touch file2 file3 # touch file5 /home/oldboyedu/file4 # touch file{a,b,c} #a和b和c {}集合,等价 touch filea fileb filec # touch file{1..10} #touch file1 file2 file3 file..Number # touch file{a..z} #a-z 语法: