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rev
===
将文件内容以字符为单位反序输出
## 补充说明
**rev命令** 将文件中的每行内容以字符为单位反序输出，即第一个字符最后输出，最后一个字符最先输出，依次类推。
### 语法
```
```
### 参数
文件：指定要反序显示内容的文件。
### 实例
```
# Generated by iptables-save v1.3.5 on Thu Dec 26 21:25:15 2013
*filter
:INPUT DROP [48113:2690676]
:FORWARD accept [0:0]
:OUTPUT ACCEPT [3381959:1818595115]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
COMMIT
# Completed on Thu Dec 26 21:25:15 2013
[root@localhost ~]# rev iptables.bak
3102 51:52:12 62 ceD uhT no 5.3.1v evas-selbatpi yb detareneG #
retlif*
]6760962:31184[ PORD TUPNI:
]0:0[ TPECCA DRAWROF:
]5115958181:9591833[ TPECCA TUPTUO:
TPECCA j- ol i- TUPNI A-
TPECCA j- 22 tropd-- pct m- pct p- TUPNI A-
TPECCA j- 08 tropd-- pct m- pct p- TUPNI A-
TPECCA j- DEHSILBATSE,DETALER etats-- etats m- TUPNI A-
TPECCA j- pmci p- TUPNI A-
TPECCA j- ol o- TUPTUO A-
TIMMOC
3102 51:52:12 62 ceD uhT no detelpmoC #
```
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