OK, this is what you have to do in order to understand how this code works:
1. Execute:
It will convert each line of the "country-code" to an "if-statements" in awk-language that instructs awk that:
if the forth-field (of the read-in line) starts with the "number" then, print the entire line followed by the "name".
Thus, if you run awk on the phone-lines.txt file with those generated "if-statements" as the executing-commands on the read-in lines, the result will be "addition of the appropriate Country-City-Name to the end of the line, based on the starting number in the forth-field of the read-in line".
You can see it for yourself, by executing:
Now, we have to add the "Second Country-City-Name to the end of the line, based on the starting number in the fifth-field of the read-in line".
We do this by piping the output of the above-command to another awk who has no phonelines.txt as its file-parameter (so, it will be forced to read the output of the previous awk in the pipe) and, as its set of "if-statements", the same sed is used but this time it is generating "$5~/^ ..." instead of "$4~/^ ..." to instruct (the second) awk that:
if the fifth-field (of the read-in line) starts with the "number" then, print the entire line followed by the "name".
Now, as for the speed, I'm afraid I don't have a 500000 line phonelines.txt file and more than that, it depends on the computer on which you're running this commands. But, one thing that I am very sure of is that both sed and awk are very fast in what they do.
As for the description of how the sed is generating the "if-statements", I would refer you to the description of "Regular Expression" either on the internet onin man-pages.
Hi, I'm come from Vietnam and want to join to Unix forum just because I like Unix programming and want to learning more.
My IP is allocate by DHCP server so it is dynamic.
Here is my desired username and my email:
Username: lucasdo
Email: rennersstar@gmail.com
Thank you very much for... (0 Replies)
Dear folks.
I have list of ip address from different country, i would like check from script this ip address belong to which country, please suggest any command, i have more than 200 ip address so i need to do it via script. Script will show me country code and its City if possible?
... (0 Replies)
Here is my daily stupid question:
How can I tell a script to only execute if the other scripts exits successfully?
So "script A" executes and it executes successfully (0),then "script B" will run
or else
"script A "executes and it exits unsucessfully (1) then "script B" will read return... (6 Replies)
Hi there,
I'm fairly new to bash scripting and already having some troubles. I'm making a script that can print some series of strings in colors based in the information of a file, for simplicity let's say it only does:
#!/bin/bash
printf "\eWhen you execute this in the command line it... (1 Reply)
Hello folks,
I have list of ips like
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
whois 1.1.1.1 |grep -E 'country|Country'
it show country=US or whatever.
so i have number of ips in text file, how i can use above script to automate output like
1.1.1.1 US
2.2.2.2 CA
3.3.3.3 FR (3 Replies)
Dear all
I have group of input lines which look like this
These input lines is placed in a file named phonelines.txt and there is a script which match $4 and $5 with country codes placed in another file named country-codes.txt and its contents is :
Italy 39
Libyana 21892
Thuraya... (12 Replies)