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
rev(参数)
参数
实例
[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 #