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$ awk 'function chk(){if(length<10)next}{chk();s=$0;if(gsub("[A-Z0-9a-z]",""))next;gsub("[,;!:)。]","");chk();a[c++]=s}END{srand();print a[int(rand()*c)]}' FILE
时不可兮骤得,聊逍遥兮容与!
$ awk 'function chk(){if(length<10)next}{chk();s=$0;if(gsub("[A-Z0-9a-z]",""))next;gsub("[,;!:)。]","");chk();a[c++]=s}END{srand();print a[int(rand()*c)]}' FILE
令飘风兮先驱,使涷雨兮洒尘;
$ awk 'function chk(){if(length<10)next}{chk();s=$0;if(gsub("[A-Z0-9a-z]",""))next;gsub("[,;!:)。]","");chk();a[c++]=s}END{srand();print a[int(rand()*c)]}' FILE
君回翔兮以下,逾空桑兮从女;
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