linux - for loop with awk

Question

My file have below data

IP      USER    PASSWORD
ip1     user1   password1
ip2     user2   password2
ip3     user3   password3

So I write below script for same

#!/bin/bash

for val in  `awk 'NR>1 {print}' servers.list`
do
        echo  $val
done

But for loop is been execute 9 times and if I wrote awk command in quotes then its execute only single time.

How can I write a script so that for loop treats every line as single so that I could parse each line and can use pscpto copy data into multiple server.

Command

pscp -p mypassword /home/user/myfile.txt user@ip:/home/user/myfile.txt

If is there any better way then this to copy file into multiple server then pls specify it bcz I am new in scripting.

Why do you need to run shell loop with awk. awk can generate same output easily without any loop. — anubhava
– anubhava, Commented Jul 17, 2020 at 21:03
@anubhava I am learning the scripting, so if you can share you knowledge or any blog (if already been describe over there) then it will be grateful for me. BTW I need to execute pscp command too thats why I am doing this way. — 200_OK
– 200_OK, Commented Jul 17, 2020 at 21:05
@anubhava pscp -p mypassword /home/user/myfile.txt user@ip:/home/user/myfile.txt — 200_OK
– 200_OK, Commented Jul 17, 2020 at 21:09
As a start copy/paste your code into shellcheck.net and fix the issues that it tells you about. — Ed Morton
– Ed Morton, Commented Jul 17, 2020 at 21:10

Ed Morton · Accepted Answer · 2020-07-17 21:55:30Z

3

It sounds like what you actually need is:

while read -r ip user password; do
    pscp -p "$password" "/home/${user}/myfile.txt" "${user}@${ip}:/home/${user}/myfile.txt"
done < <(tail -n +2 servers.list)

which really has nothing to do with what you asked for at the top of your question.

The above assumes no white space within fields nor other undesirable characters in your servers.list file.

edited Jul 17, 2020 at 21:55

answered Jul 17, 2020 at 21:15

Ed Morton

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John1024 · Accepted Answer · 2020-07-17 21:07:32Z

1

Try:

$ awk 'NR>1 {printf "IP --> %s, user --> %s, password --> %s\n",$1,$2,$3}' servers.list
IP --> ip1, user --> user1, password --> password1
IP --> ip2, user --> user2, password --> password2
IP --> ip3, user --> user3, password --> password3

When you want formatted output, like in your example, printf is very useful. The command format is printf fmt, expr-list where fmt is a string with placeholders, like %s, that are filled in from the values in the expression list.

answered Jul 17, 2020 at 21:07

John1024

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