标签：blog alt 反向 iuc 关键字 user linu test 误区
[root@hadoop-bigdata01 test]# touch aa [root@hadoop-bigdata01 test]# touch aab aabb [root@hadoop-bigdata01 test]# ll total 0 -rw-r--r-- 1 root root 0 May 16 19:47 aa -rw-r--r-- 1 root root 0 May 16 19:47 aab -rw-r--r-- 1 root root 0 May 16 19:47 aabb [root@hadoop-bigdata01 test]# ls aa aa [root@hadoop-bigdata01 test]# ls aa? aab [root@hadoop-bigdata01 test]# ls aa* aa aab aabb
正则表达式标准字符
[root@hadoop-bigdata01 test]# grep "1" /etc/passwd bin:x:1:1:bin:/bin:/sbin/nologin mail:x:8:12:mail:/var/spool/mail:/sbin/nologin uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin operator:x:11:0:operator:/root:/sbin/nologin games:x:12:100:games:/usr/games:/sbin/nologin gopher:x:13:30:gopher:/var/gopher:/sbin/nologin ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin dbus:x:81:81:System message bus:/:/sbin/nologin usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin abrt:x:173:173::/etc/abrt:/sbin/nologin wang:x:501:501::/home/wang:/bin/bash
[root@hadoop-bigdata01 test]# grep ‘[0-9][0-9][0-9]‘ /etc/passwd games:x:12:100:games:/usr/games:/sbin/nologin usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin rtkit:x:499:497:RealtimeKit:/proc:/sbin/nologin avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin abrt:x:173:173::/etc/abrt:/sbin/nologin nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin saslauth:x:498:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin pulse:x:497:496:PulseAudio System Daemon:/var/run/pulse:/sbin/nologin liucheng:x:500:500::/home/liucheng:/bin/bash wang:x:501:501::/home/wang:/bin/bas
[root@hadoop-bigdata01 test]# grep ‘^r.*n$‘ /etc/passwd rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin rtkit:x:499:497:RealtimeKit:/proc:/sbin/nologin rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
[root@hadoop-bigdata01 test]# ifconfig | grep ‘inet addr:‘ inet addr:192.168.126.191 Bcast:192.168.126.255 Mask:255.255.255.0 inet addr:127.0.0.1 Mask:255.0.0.0 [root@hadoop-bigdata01 test]# [root@hadoop-bigdata01 test]# ifconfig | grep ‘inet addr:‘ | grep -v ‘127.0.0.1‘ inet addr:192.168.126.191 Bcast:192.168.126.255 Mask:255.255.255.0 [root@hadoop-bigdata01 test]# ifconfig | grep ‘inet addr:‘ | grep -v ‘127.0.0.1‘ | sed ‘s/inet addr://g‘ 192.168.126.191 Bcast:192.168.126.255 Mask:255.255.255.0 [root@hadoop-bigdata01 test]# ifconfig | grep ‘inet addr:‘ | grep -v ‘127.0.0.1‘ | sed ‘s/inet addr://g‘ | sed ‘s/Bcast.*//g‘ 192.168.126.191
[root@hadoop-bigdata01 test]# touch ac aac abc abbc [root@hadoop-bigdata01 test]# ll total 0 -rw-r--r-- 1 root root 0 May 16 19:55 aac -rw-r--r-- 1 root root 0 May 16 19:55 abbc -rw-r--r-- 1 root root 0 May 16 19:55 abc -rw-r--r-- 1 root root 0 May 16 19:55 ac [root@hadoop-bigdata01 test]# ls | grep ‘a*c‘ aac abbc abc ac [root@hadoop-bigdata01 test]# ls | grep ‘a.*c‘ aac abbc abc ac [root@hadoop-bigdata01 test]# ls | grep ‘^a.*c‘ aac abbc abc ac [root@hadoop-bigdata01 test]# ls | grep ‘^a*c‘ aac ac
[root@hadoop-bigdata01 test]# ls a aac abb abbc abc ac b bb c cb [root@hadoop-bigdata01 test]# ls | grep ‘a*b‘ abb abbc abc b bb cb
这里grep ‘a*b‘ 指的可不是含有a和b 而是a重复0次或者多次然后含有b
标签：blog alt 反向 iuc 关键字 user linu test 误区
原文地址：http://www.cnblogs.com/itliucheng/p/6892005.html
