Construct a command based upon a count variable in bash

Question

I want to construct a command based upon the number of groups in the yaml file shown in the Example..

Example:

I have groups command as below which extracts the groups from the iamIdentityMappings yaml file,

groups=$(yq read -j generated/identity-mapping.yaml "iamIdentityMappings.[0].groups")

iamIdentityMappings yaml file:

iamIdentityMappings:
- groups:
  - Appdeployer
  - Moregroups
  rolearn: arn:aws:iam::12345:role/eks-project-us-east-1-ppdeployer
  username: user1

Since there are two groups in groups array,I need to add two groups in the below command,

 eksctl create iamidentitymapping --cluster "$name" --region "$region" --arn "$rolearn" --group "Appdeployer" -group "Moregroups" --username "$username"

If there are 3 groups,then --group should be repeated 3 times in the command.

Please let me know how to do this in bash

Does this answer your question? Convery yaml array to string array — user1934428
– user1934428, Commented Jul 16, 2020 at 6:07
What have you tried? Why/how did it not work? idownvotedbecau.se/noattempt — Paul Hodges
– Paul Hodges, Commented Jul 16, 2020 at 13:49

Rad4 · Accepted Answer · 2020-07-16 04:09:03Z

0

I have figured out..

grouparr=''
    for group in $groups; do
       echo $group
       if [[ ! $group == '-' ]]; then
          grouparr+=" --group $group "
       fi
    done

answered Jul 16, 2020 at 4:09

Rad4

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3 Comments

Marcin Orlowski Over a year ago

Always quote used variables. Also ${name} syntax is recommended

Gordon Davisson Over a year ago

The for group in $groups part can fail in weird ways if any group names contain spaces (or other whitespace) or anything that can be mistaken for a shell filename wildcard (that includes square brackets).

user1934428 Over a year ago

@Rad4: Instead of putting the values together into a string and rely on word splitting to tear them apart (which would fail if you have spaces in group names), I suggest that you use an array to collect the paramters.

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