wuchunlai_2012的博客

shutdownshutdown [-h][-i][-k][-m][-t]shutdown -time 30 // 30分钟后关机shutdown -h -time 30 // 关机后关掉电源（彻底关机）shutdown -h now // 立即关机并关闭电源 halt命令shutdown -k // 给其他用户发送关机预警2.

压缩比及压缩速度测试:$ head -n 2000 cc_detail_201608.sql > 1$ time tar -c –lzma -f 1.glz 1 real 23m44.216s$ time tar -c –xz -f 1.gxz 1 real 25m26.296s$ time tar -czf 1.tgz 1 real 1m17.476s$ time tar

pstack pstack pid 显示某个进程的栈跟踪，必须在对应的用户组或root下操作。[wuchunlai@s1 ~]$ sudo -u work pstack $(pgrep cc_engine)Thread 3 (Thread 0x7fb3467ff700 (LWP 6130)):#0 0x000000370cae5d03 in epoll_wait () from /li