Bash scripting Array concepts

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I have two seperate lists. one contains 1000 hostnames and other contains 1000 associated IP's for that hosts. I need to generate config entries and push to my config file to add all hosts under our monitoring environment.

 #!/bin/bash
 Enter the hostnames
 readarray hosts
 Enter the IP's
 readarray IP

how I iterate one by one in loop like below. I know how to iterate single array by using for i in "$hosts[@]", but in the case of two seperate lists, how to achieve iteration, anyone please assist me on this.

 echo -e "nObject host ""$hosts"""
 import = ""generic-service""
 address = ""$IP""
 group = ""Mom1-Ping"" 
 "n" >> /etc/icinga2/zones.d/mom2/AP.conf

Example of first list (List 1):

sjc02-mfg-api01.example.com 
sjc02-mfg-api02.example.com
sjc02-mfg-api03.example.com

upto 1000 hosts

Example of second list (List 2):

10.20.2.22 
10.20.2.23 
10.20.2.24

upto to 1000 IP's

Expected output:

 Object host "sjc02-mfg-api01.example.com" 
 import = "generic-service"
 address = "10.20.2.22"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api02.example.com" 
 import = "generic-service"
 address = "10.20.2.23"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api03.example.com" 
 import = "generic-service"
 address = "10.20.2.24"
 group = "Mom01-Ping"
 

 ..........like this I need to generate to all 1000 hosts.............

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

Hellp @naren viru. May I kindly ask you to include example of the two lists ? Thanks!
â€“Â Goro
3 hours ago

List 1: sjc02-mfg-api01.example.com sjc02-mfg-api02.example.com . List 2: 10.20.2.22 10.20.2.23 Expected Output: Object host "sjc02-mfg-api01.example.com" import = "generic-service" address = "10.20.2.22" group = "Mom01-Ping" Object host "sjc02-mfg-api02.example.com" import = "generic-service" address = "10.20.2.23" group = "Mom01-Ping" Like this I need to generate for 1000 devices
â€“Â naren viru
3 hours ago

need to read hostname from one list and read IP information from another list.
â€“Â naren viru
3 hours ago

And use both information to generate config entries
â€“Â naren viru
3 hours ago

1

Yes @goro, done it
â€“Â naren viru
3 hours ago

Â |Â
show 2 more comments

up vote
3
down vote

favorite

 #!/bin/bash
 Enter the hostnames
 readarray hosts
 Enter the IP's
 readarray IP

 echo -e "nObject host ""$hosts"""
 import = ""generic-service""
 address = ""$IP""
 group = ""Mom1-Ping"" 
 "n" >> /etc/icinga2/zones.d/mom2/AP.conf

Example of first list (List 1):

sjc02-mfg-api01.example.com 
sjc02-mfg-api02.example.com
sjc02-mfg-api03.example.com

upto 1000 hosts

Example of second list (List 2):

10.20.2.22 
10.20.2.23 
10.20.2.24

upto to 1000 IP's

Expected output:

 Object host "sjc02-mfg-api01.example.com" 
 import = "generic-service"
 address = "10.20.2.22"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api02.example.com" 
 import = "generic-service"
 address = "10.20.2.23"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api03.example.com" 
 import = "generic-service"
 address = "10.20.2.24"
 group = "Mom01-Ping"
 

 ..........like this I need to generate to all 1000 hosts.............

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

Hellp @naren viru. May I kindly ask you to include example of the two lists ? Thanks!
â€“Â Goro
3 hours ago

List 1: sjc02-mfg-api01.example.com sjc02-mfg-api02.example.com . List 2: 10.20.2.22 10.20.2.23 Expected Output: Object host "sjc02-mfg-api01.example.com" import = "generic-service" address = "10.20.2.22" group = "Mom01-Ping" Object host "sjc02-mfg-api02.example.com" import = "generic-service" address = "10.20.2.23" group = "Mom01-Ping" Like this I need to generate for 1000 devices
â€“Â naren viru
3 hours ago

need to read hostname from one list and read IP information from another list.
â€“Â naren viru
3 hours ago

And use both information to generate config entries
â€“Â naren viru
3 hours ago

1

Yes @goro, done it
â€“Â naren viru
3 hours ago

Â |Â
show 2 more comments

up vote
3
down vote

favorite

 #!/bin/bash
 Enter the hostnames
 readarray hosts
 Enter the IP's
 readarray IP

 echo -e "nObject host ""$hosts"""
 import = ""generic-service""
 address = ""$IP""
 group = ""Mom1-Ping"" 
 "n" >> /etc/icinga2/zones.d/mom2/AP.conf

Example of first list (List 1):

sjc02-mfg-api01.example.com 
sjc02-mfg-api02.example.com
sjc02-mfg-api03.example.com

upto 1000 hosts

Example of second list (List 2):

10.20.2.22 
10.20.2.23 
10.20.2.24

upto to 1000 IP's

Expected output:

 Object host "sjc02-mfg-api01.example.com" 
 import = "generic-service"
 address = "10.20.2.22"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api02.example.com" 
 import = "generic-service"
 address = "10.20.2.23"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api03.example.com" 
 import = "generic-service"
 address = "10.20.2.24"
 group = "Mom01-Ping"
 

 ..........like this I need to generate to all 1000 hosts.............

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

 #!/bin/bash
 Enter the hostnames
 readarray hosts
 Enter the IP's
 readarray IP

 echo -e "nObject host ""$hosts"""
 import = ""generic-service""
 address = ""$IP""
 group = ""Mom1-Ping"" 
 "n" >> /etc/icinga2/zones.d/mom2/AP.conf

Example of first list (List 1):

sjc02-mfg-api01.example.com 
sjc02-mfg-api02.example.com
sjc02-mfg-api03.example.com

upto 1000 hosts

Example of second list (List 2):

10.20.2.22 
10.20.2.23 
10.20.2.24

upto to 1000 IP's

Expected output:

 Object host "sjc02-mfg-api01.example.com" 
 import = "generic-service"
 address = "10.20.2.22"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api02.example.com" 
 import = "generic-service"
 address = "10.20.2.23"
 group = "Mom01-Ping"
 

 Object host "sjc02-mfg-api03.example.com" 
 import = "generic-service"
 address = "10.20.2.24"
 group = "Mom01-Ping"
 

 ..........like this I need to generate to all 1000 hosts.............

shell-script icinga2

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

edited 3 hours ago

asked 3 hours ago

naren viru

213

New contributor

asked 3 hours ago

naren viru

213

asked 3 hours ago

naren viru

213

New contributor

naren viru is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Hellp @naren viru. May I kindly ask you to include example of the two lists ? Thanks!
â€“Â Goro
3 hours ago

List 1: sjc02-mfg-api01.example.com sjc02-mfg-api02.example.com . List 2: 10.20.2.22 10.20.2.23 Expected Output: Object host "sjc02-mfg-api01.example.com" import = "generic-service" address = "10.20.2.22" group = "Mom01-Ping" Object host "sjc02-mfg-api02.example.com" import = "generic-service" address = "10.20.2.23" group = "Mom01-Ping" Like this I need to generate for 1000 devices
â€“Â naren viru
3 hours ago

need to read hostname from one list and read IP information from another list.
â€“Â naren viru
3 hours ago

And use both information to generate config entries
â€“Â naren viru
3 hours ago

1

Yes @goro, done it
â€“Â naren viru
3 hours ago

Â |Â
show 2 more comments

Hellp @naren viru. May I kindly ask you to include example of the two lists ? Thanks!
â€“Â Goro
3 hours ago

List 1: sjc02-mfg-api01.example.com sjc02-mfg-api02.example.com . List 2: 10.20.2.22 10.20.2.23 Expected Output: Object host "sjc02-mfg-api01.example.com" import = "generic-service" address = "10.20.2.22" group = "Mom01-Ping" Object host "sjc02-mfg-api02.example.com" import = "generic-service" address = "10.20.2.23" group = "Mom01-Ping" Like this I need to generate for 1000 devices
â€“Â naren viru
3 hours ago

need to read hostname from one list and read IP information from another list.
â€“Â naren viru
3 hours ago

And use both information to generate config entries
â€“Â naren viru
3 hours ago

1

Yes @goro, done it
â€“Â naren viru
3 hours ago

Hellp @naren viru. May I kindly ask you to include example of the two lists ? Thanks!
â€“Â Goro
3 hours ago

List 1: sjc02-mfg-api01.example.com sjc02-mfg-api02.example.com . List 2: 10.20.2.22 10.20.2.23 Expected Output: Object host "sjc02-mfg-api01.example.com" import = "generic-service" address = "10.20.2.22" group = "Mom01-Ping" Object host "sjc02-mfg-api02.example.com" import = "generic-service" address = "10.20.2.23" group = "Mom01-Ping" Like this I need to generate for 1000 devices
â€“Â naren viru
3 hours ago

need to read hostname from one list and read IP information from another list.
â€“Â naren viru
3 hours ago

And use both information to generate config entries
â€“Â naren viru
3 hours ago

Yes @goro, done it
â€“Â naren viru
3 hours ago

Â |Â
show 2 more comments

2 Answers
2

active

oldest

votes

up vote
5
down vote

Combine your both lists together using paste. You can do it as follows:

#!/bin/bash
paste list1 list2 | while IFS=$'t' read -r L1 L2 
do
echo "
Object host $L1 
 import = "generic-service"
 address = $L2
 group = "Mom01-Ping"
 " 
done

output:

Object host sjc02-mfg-api01.example.com 
 import = generic-service
 address = 10.20.2.22 
 group = Mom01-Ping
 

Object host sjc02-mfg-api02.example.com 
 import = generic-service
 address = 10.20.2.23 
 group = Mom01-Ping
 

Object host sjc02-mfg-api03.example.com 
 import = generic-service
 address = 10.20.2.24
 group = Mom01-Ping

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

1

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

add a commentÂ |Â

up vote
2
down vote

You can iterate over the indices of the pair of arrays:

a1=(foo bar baz)
a2=(one two three)

for ((i=0; i < "$#a1[@]"; i++)); do 
 echo "$a1[i] => $a2[i]"
done

where $#a1[@] is the size of the a1 array

answered 20 mins ago

glenn jackman

48.1k365105

add a commentÂ |Â

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
5
down vote

Combine your both lists together using paste. You can do it as follows:

#!/bin/bash
paste list1 list2 | while IFS=$'t' read -r L1 L2 
do
echo "
Object host $L1 
 import = "generic-service"
 address = $L2
 group = "Mom01-Ping"
 " 
done

output:

Object host sjc02-mfg-api01.example.com 
 import = generic-service
 address = 10.20.2.22 
 group = Mom01-Ping
 

Object host sjc02-mfg-api02.example.com 
 import = generic-service
 address = 10.20.2.23 
 group = Mom01-Ping
 

Object host sjc02-mfg-api03.example.com 
 import = generic-service
 address = 10.20.2.24
 group = Mom01-Ping

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

1

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

add a commentÂ |Â

up vote
5
down vote

Combine your both lists together using paste. You can do it as follows:

#!/bin/bash
paste list1 list2 | while IFS=$'t' read -r L1 L2 
do
echo "
Object host $L1 
 import = "generic-service"
 address = $L2
 group = "Mom01-Ping"
 " 
done

output:

Object host sjc02-mfg-api01.example.com 
 import = generic-service
 address = 10.20.2.22 
 group = Mom01-Ping
 

Object host sjc02-mfg-api02.example.com 
 import = generic-service
 address = 10.20.2.23 
 group = Mom01-Ping
 

Object host sjc02-mfg-api03.example.com 
 import = generic-service
 address = 10.20.2.24
 group = Mom01-Ping

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

1

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

add a commentÂ |Â

up vote
5
down vote

Combine your both lists together using paste. You can do it as follows:

#!/bin/bash
paste list1 list2 | while IFS=$'t' read -r L1 L2 
do
echo "
Object host $L1 
 import = "generic-service"
 address = $L2
 group = "Mom01-Ping"
 " 
done

output:

Object host sjc02-mfg-api01.example.com 
 import = generic-service
 address = 10.20.2.22 
 group = Mom01-Ping
 

Object host sjc02-mfg-api02.example.com 
 import = generic-service
 address = 10.20.2.23 
 group = Mom01-Ping
 

Object host sjc02-mfg-api03.example.com 
 import = generic-service
 address = 10.20.2.24
 group = Mom01-Ping

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

Combine your both lists together using paste. You can do it as follows:

#!/bin/bash
paste list1 list2 | while IFS=$'t' read -r L1 L2 
do
echo "
Object host $L1 
 import = "generic-service"
 address = $L2
 group = "Mom01-Ping"
 " 
done

output:

Object host sjc02-mfg-api01.example.com 
 import = generic-service
 address = 10.20.2.22 
 group = Mom01-Ping
 

Object host sjc02-mfg-api02.example.com 
 import = generic-service
 address = 10.20.2.23 
 group = Mom01-Ping
 

Object host sjc02-mfg-api03.example.com 
 import = generic-service
 address = 10.20.2.24
 group = Mom01-Ping

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

edited 22 mins ago

answered 3 hours ago

Goro

4,84052358

answered 3 hours ago

Goro

4,84052358

answered 3 hours ago

Goro

4,84052358

1

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

add a commentÂ |Â

1

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

You can use IFS=$'t' in bash for a literal tab character.
â€“Â glenn jackman
24 mins ago

Dear @glenn jackman. Correct! Thank you so much for the note!. I updated the answer ;-)
â€“Â Goro
22 mins ago

add a commentÂ |Â

up vote
2
down vote

You can iterate over the indices of the pair of arrays:

a1=(foo bar baz)
a2=(one two three)

for ((i=0; i < "$#a1[@]"; i++)); do 
 echo "$a1[i] => $a2[i]"
done

where $#a1[@] is the size of the a1 array

answered 20 mins ago

glenn jackman

48.1k365105

add a commentÂ |Â

up vote
2
down vote

You can iterate over the indices of the pair of arrays:

a1=(foo bar baz)
a2=(one two three)

for ((i=0; i < "$#a1[@]"; i++)); do 
 echo "$a1[i] => $a2[i]"
done

where $#a1[@] is the size of the a1 array

answered 20 mins ago

glenn jackman

48.1k365105

add a commentÂ |Â

up vote
2
down vote

You can iterate over the indices of the pair of arrays:

a1=(foo bar baz)
a2=(one two three)

for ((i=0; i < "$#a1[@]"; i++)); do 
 echo "$a1[i] => $a2[i]"
done

where $#a1[@] is the size of the a1 array

answered 20 mins ago

glenn jackman

48.1k365105

You can iterate over the indices of the pair of arrays:

a1=(foo bar baz)
a2=(one two three)

for ((i=0; i < "$#a1[@]"; i++)); do 
 echo "$a1[i] => $a2[i]"
done

where $#a1[@] is the size of the a1 array

answered 20 mins ago

glenn jackman

48.1k365105

answered 20 mins ago

glenn jackman

48.1k365105

answered 20 mins ago

glenn jackman

48.1k365105

answered 20 mins ago

glenn jackman

48.1k365105

add a commentÂ |Â

naren viru is a new contributor. Be nice, and check out our Code of Conduct.

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