单词锁定符,如: 'grep'只匹配grep
[root@86 ttf-arphic-uming-0.0.20050501]# cat /proc/diskstats 1 0 ram0 0 0 0 0 0 0 0 0 0 0 0 1 1 ram1 0 0 0 0 0 0 0 0 0 0 0 1 2 ram2 0 0 0 0 0 0 0 0 0 0 0 1 3 ram3 0 0 0 0 0 0 0 0 0 0 0 1 4 ram4 0 0 0 0 0 0 0 0 0 0 0 1 5 ram5 0 0 0 0 0 0 0 0 0 0 0 1 6 ram6 0 0 0 0 0 0 0 0 0 0 0 1 7 ram7 0 0 0 0 0 0 0 0 0 0 0 1 8 ram8 0 0 0 0 0 0 0 0 0 0 0 1 9 ram9 0 0 0 0 0 0 0 0 0 0 0 1 10 ram10 0 0 0 0 0 0 0 0 0 0 0 1 11 ram11 0 0 0 0 0 0 0 0 0 0 0 1 12 ram12 0 0 0 0 0 0 0 0 0 0 0 1 13 ram13 0 0 0 0 0 0 0 0 0 0 0 1 14 ram14 0 0 0 0 0 0 0 0 0 0 0 1 15 ram15 0 0 0 0 0 0 0 0 0 0 0 7 0 loop0 0 0 0 0 0 0 0 0 0 0 0 7 1 loop1 0 0 0 0 0 0 0 0 0 0 0 7 2 loop2 0 0 0 0 0 0 0 0 0 0 0 7 3 loop3 0 0 0 0 0 0 0 0 0 0 0 7 4 loop4 0 0 0 0 0 0 0 0 0 0 0 7 5 loop5 0 0 0 0 0 0 0 0 0 0 0 7 6 loop6 0 0 0 0 0 0 0 0 0 0 0 7 7 loop7 0 0 0 0 0 0 0 0 0 0 0 202 0 xvda 82523 258 2428188 331412 316952 778724 8778096 9298675 0 325192 9630429 202 1 xvda1 82359 258 2426876 331278 316952 778724 8778096 9298675 0 325058 9630295
注意配置一个单词的意思是不会包括数字的的一串字母！！！！
[root@86 ttf-arphic-uming-0.0.20050501]# cat /proc/diskstats|grep -E "sd[a-z]|xvd[a-z]" 202 0 xvda 82571 258 2428572 331629 319518 779539 8805144 9310801 0 327449 9642771
[root@86 ttf-arphic-uming-0.0.20050501]# cat /proc/diskstats|grep -E "sd[a-z]|xvd[a-z]"|awk '{print $3}'