grep' \b\b'

\b单词锁定符,如: '\bgrep\b'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 "\bsd[a-z]\b|\bxvd[a-z]\b"

 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 "\bsd[a-z]\b|\bxvd[a-z]\b"|awk '{print $3}'

巴特西

grep' \b\b'

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