Detailed explanation of rev command

Introduction

The rev command outputs the contents of each line in the file in reverse order of characters, that is, the first character is output last, the last character is output first, and so on. Let’s Let’s explain in detail how to use the chcon command.

grammar

rev(参数)

parameter

文件：指定要反序显示内容的文件。

[root@localhost ~]# cat iptables.bak 
# 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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