#jps 报错了Java HotSpot(TM) 64-Bit Server VM warning: Insufficient space for shared memory file: /tmp/hsperfdata_root/15746 Try using the -Djava.io.tmpdir= option to select an alternate temp location.df -h发现某一个满的分区清理一些日志文件 恢复正常起namenode时,had...【阅读全文】
1. 从stdin读取输入 $ echo -e "this is a word\nnext line" | grep word2. 在单个文件中搜索文本chicol@debian:~/scripts/chapter_4$ grep word a.txt this is a word3. 在多个文件中搜索文本chicol@debian:~/scripts/chapter_4$ grep word a.txt b.txt a.txt:this is a wordb.txt:this is another...【阅读全文】