Resumen:

Imprimir de forma inversa cada línea de archivo.txt:

while read in; do 
echo "$in"| rev ; 
done < archivo.txt

El comando rev imprime el texto de forma inversa. Hola lo imprimirá aloH

echo "Hola mundo" | rev
odnum aloH

 

En ocasiones es necesario  ejecutar un comando por cada línea de un archivo. En este ejemplo se imprimirá la misma línea de forma inversa, con el objetivo de poder manipular el string de forma más fácil

El archivo síguete archivo  tiene caracteres especiales (—- More^M —-^[[42D ^[[42D ) lo cual dificulta la manipulación
. Lo que se pretende es imprimir en orden inverso cada linea y usado  “cut” eliminar los caracteres especiales.

 

tcp  VPN: public --> public  10.90.145.11:52437 --> 172.24.4.6:31943
 icmp  VPN: public --> public  172.24.4.6:41044 --> 172.24.0.5:2048
 icmp  VPN: public --> public  10.254.253.18:13482 --> 172.24.6.162:2048
 icmp  VPN: public --> public  172.24.4.6:63572 --> 172.24.0.1:2048
 https  VPN: public --> public  172.24.1.149:46169 --> 172.24.1.135:443
 icmp  VPN: public --> public  10.90.145.13:31742 --> 172.24.6.66:2048
 tcp  VPN: public --> public  172.24.7.37:50544 --> 172.24.7.118:8088
 udp  VPN: public --> public  172.24.8.214:13456 --> 192.141.244.6:38812
 tcp  VPN: public --> public  172.24.7.37:46394 --> 172.24.7.118:8088
 tcp  VPN: public --> public  192.168.202.11:44434 --> 172.24.6.162:7081
 tcp  VPN: public --> public  10.90.145.13:46860 --> 172.24.4.6:31943
 tcp  VPN: public --> public  172.24.8.20:36267 --> 172.24.8.136:8084
 http  VPN: public --> public  172.24.6.161:28230 --> 10.254.253.23:80
 tcp  VPN: public --> public  172.24.3.14:55335 --> 172.24.4.34:8088
 icmp  VPN: public --> public  10.90.145.13:31686 --> 172.24.6.164:2048
 tcp  VPN: public --> public  172.24.3.14:49684 --> 172.24.4.28:8088
 tcp  VPN: public --> public  10.254.253.25:46428 --> 172.24.6.162:7181
 tcp  VPN: public --> public  192.168.206.11:57416 --> 172.24.6.162:7081
 tcp  VPN: public --> public  192.168.202.11:44420 --> 172.24.6.162:7081
 tcp  VPN: public --> public  192.168.202.11:44354 --> 172.24.6.162:7081
 icmp  VPN: public --> public  10.90.145.13:31780 --> 172.24.2.137:2048
 tcp  VPN: public --> public  10.254.253.25:42030 --> 172.24.6.162:7081
 tcp  VPN: public --> public  192.168.202.11:44406 --> 172.24.6.162:7081
  ---- More^M ----^[[42D                                          ^[[42D tcp  VPN: public --> public  10.8.73.91:40168 --> 172.24.6.23:16570
 tcp  VPN: public --> public  10.8.73.116:35450 --> 172.24.6.23:16570
 tcp  VPN: public --> public  10.254.253.25:46054 --> 172.24.6.162:7181
 icmp  VPN: public --> public  10.90.145.13:31726 --> 172.24.8.38:2048
 sctp  VPN: public --> public  172.24.1.170:3101 --> 10.2.85.7:2905
 tcp  VPN: public --> public  172.24.8.137:24992 --> 172.24.8.76:8089
 tcp  VPN: public --> public  10.254.253.25:42192 --> 172.24.6.162:7081
 tcp  VPN: public --> public  10.254.253.25:41974 --> 172.24.6.162:7081
 icmp  VPN: public --> public  10.90.145.13:31750 --> 172.24.2.166:2048
 tcp  VPN: public --> public  192.168.202.11:44462 --> 172.24.6.162:7081
 tcp  VPN: public --> public  192.168.202.11:44368 --> 172.24.6.162:7081
 icmp  VPN: public --> public  172.24.6.99:40522 --> 172.24.6.1:2048
 tcp  VPN: public --> public  10.254.253.25:42188 --> 172.24.6.162:7081
 tcp  VPN: public --> public  192.168.202.11:44452 --> 172.24.6.162:7081
 tcp  VPN: public --> public  172.24.8.21:34592 --> 172.24.8.137:8084
 tcp  VPN: public --> public  Remote 192.141.246.54:43930 --> 172.24.6.23:16560
 tcp  VPN: public --> public  192.168.202.11:44468 --> 172.24.6.162:7081
 icmp  VPN: public --> public  172.24.6.199:37977 --> 10.1.12.12:2048
 tcp  VPN: public --> public  172.24.7.37:58019 --> 172.24.7.118:8088
 tcp  VPN: public --> public  172.24.6.150:63850 --> 10.254.253.11:2222
 tcp  VPN: public --> public  172.24.8.23:31378 --> 192.141.246.100:2276
 tcp  VPN: public --> public  10.254.253.25:41850 --> 172.24.6.162:7081
 tcp  VPN: public --> public  Remote 172.24.8.137:37634 --> 172.24.8.15:13101
 snmp  VPN: public --> public  10.90.145.20:58981 --> 172.24.4.5:161
  ---- More^M ----^[[42D                                          ^[[42D icmp  VPN: public --> public  172.24.3.210:8442 --> 172.24.4.27:2048
 tcp  VPN: public --> public  10.254.253.25:46340 --> 172.24.6.162:7181
 tcp  VPN: public --> public  10.254.253.25:41808 --> 172.24.6.162:7081
 tcp  VPN: public --> public  10.254.253.25:41992 --> 172.24.6.162:7081
 tcp  VPN: public --> public  10.254.253.25:42202 --> 172.24.6.162:7081

Este script elimina los caracteres especiales y columnas no necesarias de archivo.txt

 


  while read in; do echo "$in"| rev ; done < au.txt | cut -d ':' -f1-3 | rev

 

De esto:


  ---- More^M ----^[[42D                                          ^[[42D tcp  VPN: public --> public  10.8.73.91:40168 --> 172.24.6.23:16570

A esto:


public --> public  10.8.73.91:40168 --> 172.24.6.23:16570