grep

案例一： 字符锁定；匹配非数字

[root@ZabbixServer ~]# cat /proc/diskstats | egrep "sd[`echo {a..z}`]"
   8       0 sda 16263 24 983889 243578 201473 1904 10533390 1375457 0 333842 1597554
   8       1 sda1 369 0 8925 1450 9 0 4096 8 0 1376 1457
   8       2 sda2 15769 24 973012 242051 201464 1904 10529294 1375449 0 333373 1595936
[root@ZabbixServer ~]# cat /proc/diskstats | egrep "\bsd[`echo {a..z}`]\b"
   8       0 sda 16263 24 983889 243578 201583 1906 10540000 1375912 0 333907 1597989
[root@ZabbixServer ~]#