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I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment):
EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id $SharedFileSystem | jq '.MountTargets[].IpAddress' -r) )
echo "IPs in EFS_SERVER_IPS_ARRAY:"
for element in "$EFS_SERVER_IPS_ARRAY[@]"
do
echo "$element"
echo "$element $MOUNT_SOURCE" >> /etc/hosts
done
This works, but looks ugly. I want to avoid the array variable, and the for loop (basically I don't care about the first echo command).
Can I somehow use the output ($element, which is 1 or more, currently 2 lines of IPs) and funnel it into two executions of something like:
long AWS command >> echo $element $MOUNT_SOURCE >> /etc/hosts
with echo executing as many times as there are variables in the array, in current implementation. How would I rewrite this?
The output of the AWS command, like like:
10.10.10.10
10.22.22.22
Then, the added lines in /etc/hosts, look like:
10.10.10.10 unique-id.efs.us-east-1.amazonaws.com
10.22.22.22 unique-id.efs.us-east-1.amazonaws.com
bash shell-script aws bash-expansion bash-array
asked 4 hours ago
CarmageddonCarmageddon
1235
|
show 5 more comments
I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment):
EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id $SharedFileSystem | jq '.MountTargets[].IpAddress' -r) )
echo "IPs in EFS_SERVER_IPS_ARRAY:"
for element in "$EFS_SERVER_IPS_ARRAY[@]"
do
echo "$element"
echo "$element $MOUNT_SOURCE" >> /etc/hosts
done
This works, but looks ugly. I want to avoid the array variable, and the for loop (basically I don't care about the first echo command).
Can I somehow use the output ($element, which is 1 or more, currently 2 lines of IPs) and funnel it into two executions of something like:
long AWS command >> echo $element $MOUNT_SOURCE >> /etc/hosts
with echo executing as many times as there are variables in the array, in current implementation. How would I rewrite this?
The output of the AWS command, like like:
10.10.10.10
10.22.22.22
Then, the added lines in /etc/hosts, look like:
10.10.10.10 unique-id.efs.us-east-1.amazonaws.com
10.22.22.22 unique-id.efs.us-east-1.amazonaws.com
bash shell-script aws bash-expansion bash-array
asked 4 hours ago
CarmageddonCarmageddon
1235
oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
Yes but is this really adding the IP address to your/etc/hosts? It seems more likely it is just adding the literal numbers0and1to it.
– Jesse_b
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
1
No I'm saying that when an array is called with the$!name[@]syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).
– Jesse_b
4 hours ago
|
show 5 more comments
I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment):
EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id $SharedFileSystem | jq '.MountTargets[].IpAddress' -r) )
echo "IPs in EFS_SERVER_IPS_ARRAY:"
for element in "$EFS_SERVER_IPS_ARRAY[@]"
do
echo "$element"
echo "$element $MOUNT_SOURCE" >> /etc/hosts
done
This works, but looks ugly. I want to avoid the array variable, and the for loop (basically I don't care about the first echo command).
Can I somehow use the output ($element, which is 1 or more, currently 2 lines of IPs) and funnel it into two executions of something like:
long AWS command >> echo $element $MOUNT_SOURCE >> /etc/hosts
with echo executing as many times as there are variables in the array, in current implementation. How would I rewrite this?
The output of the AWS command, like like:
10.10.10.10
10.22.22.22
Then, the added lines in /etc/hosts, look like:
10.10.10.10 unique-id.efs.us-east-1.amazonaws.com
10.22.22.22 unique-id.efs.us-east-1.amazonaws.com
bash shell-script aws bash-expansion bash-array
asked 4 hours ago
CarmageddonCarmageddon
1235
I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment):
EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id $SharedFileSystem | jq '.MountTargets[].IpAddress' -r) )
echo "IPs in EFS_SERVER_IPS_ARRAY:"
for element in "$EFS_SERVER_IPS_ARRAY[@]"
do
echo "$element"
echo "$element $MOUNT_SOURCE" >> /etc/hosts
done
This works, but looks ugly. I want to avoid the array variable, and the for loop (basically I don't care about the first echo command).
Can I somehow use the output ($element, which is 1 or more, currently 2 lines of IPs) and funnel it into two executions of something like:
long AWS command >> echo $element $MOUNT_SOURCE >> /etc/hosts
with echo executing as many times as there are variables in the array, in current implementation. How would I rewrite this?
The output of the AWS command, like like:
10.10.10.10
10.22.22.22
Then, the added lines in /etc/hosts, look like:
10.10.10.10 unique-id.efs.us-east-1.amazonaws.com
10.22.22.22 unique-id.efs.us-east-1.amazonaws.com
bash shell-script aws bash-expansion bash-array
bash shell-script aws bash-expansion bash-array
asked 4 hours ago
CarmageddonCarmageddon
1235
asked 4 hours ago
CarmageddonCarmageddon
1235
edited 3 hours ago
Carmageddon
asked 4 hours ago
CarmageddonCarmageddon
1235
asked 4 hours ago
CarmageddonCarmageddon
1235
asked 4 hours ago
CarmageddonCarmageddon
1235
1235
oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
Yes but is this really adding the IP address to your/etc/hosts? It seems more likely it is just adding the literal numbers0and1to it.
– Jesse_b
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
1
No I'm saying that when an array is called with the$!name[@]syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).
– Jesse_b
4 hours ago
|
show 5 more comments
oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
Yes but is this really adding the IP address to your/etc/hosts? It seems more likely it is just adding the literal numbers0and1to it.
– Jesse_b
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
1
No I'm saying that when an array is called with the$!name[@]syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).
– Jesse_b
4 hours ago
oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
Yes but is this really adding the IP address to your
/etc/hosts? It seems more likely it is just adding the literal numbers 0 and 1 to it.– Jesse_b
4 hours ago
Yes but is this really adding the IP address to your
/etc/hosts? It seems more likely it is just adding the literal numbers 0 and 1 to it.– Jesse_b
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
1
1
No I'm saying that when an array is called with the
$!name[@] syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).– Jesse_b
4 hours ago
No I'm saying that when an array is called with the
$!name[@] syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).– Jesse_b
4 hours ago
|
show 5 more comments
1 Answer
1
active
oldest
votes
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq --arg mntsrc "$MOUNT_SOURCE" '.MountTargets[].IpAddress | . + $mntsrc' -r >> /etc/hosts
or, if you prefer,
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq '.MountTargets[].IpAddress' -r | sed -e "s~$~$MOUNT_SOURCE~" >> /etc/hosts
All that's happening is adding some extra fixed text to the end of each line, which can happen either in jq (top) or in various ways outside (bottom). There's not really any array context here or anything being repeated, so you don't need a loop.
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
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oldest
votes
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq --arg mntsrc "$MOUNT_SOURCE" '.MountTargets[].IpAddress | . + $mntsrc' -r >> /etc/hosts
or, if you prefer,
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq '.MountTargets[].IpAddress' -r | sed -e "s~$~$MOUNT_SOURCE~" >> /etc/hosts
All that's happening is adding some extra fixed text to the end of each line, which can happen either in jq (top) or in various ways outside (bottom). There's not really any array context here or anything being repeated, so you don't need a loop.
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
add a comment |
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq --arg mntsrc "$MOUNT_SOURCE" '.MountTargets[].IpAddress | . + $mntsrc' -r >> /etc/hosts
or, if you prefer,
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq '.MountTargets[].IpAddress' -r | sed -e "s~$~$MOUNT_SOURCE~" >> /etc/hosts
All that's happening is adding some extra fixed text to the end of each line, which can happen either in jq (top) or in various ways outside (bottom). There's not really any array context here or anything being repeated, so you don't need a loop.
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
add a comment |
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq --arg mntsrc "$MOUNT_SOURCE" '.MountTargets[].IpAddress | . + $mntsrc' -r >> /etc/hosts
or, if you prefer,
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq '.MountTargets[].IpAddress' -r | sed -e "s~$~$MOUNT_SOURCE~" >> /etc/hosts
All that's happening is adding some extra fixed text to the end of each line, which can happen either in jq (top) or in various ways outside (bottom). There's not really any array context here or anything being repeated, so you don't need a loop.
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq --arg mntsrc "$MOUNT_SOURCE" '.MountTargets[].IpAddress | . + $mntsrc' -r >> /etc/hosts
or, if you prefer,
aws efs describe-mount-targets --file-system-id $SharedFileSystem
| jq '.MountTargets[].IpAddress' -r | sed -e "s~$~$MOUNT_SOURCE~" >> /etc/hosts
All that's happening is adding some extra fixed text to the end of each line, which can happen either in jq (top) or in various ways outside (bottom). There's not really any array context here or anything being repeated, so you don't need a loop.
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
answered 3 hours ago
Michael HomerMichael Homer
52.3k9144181
52.3k9144181
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
add a comment |
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
1
1
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
Damn hot! Thanks Michael!! I am a happy puppy now, the first one is great. I didnt know about the --args on jq, neat :)
– Carmageddon
3 hours ago
add a comment |
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oh is it? I didnt know.. anyway its immaterial, question still stands :)
– Carmageddon
4 hours ago
@Jesse_b I edited, added sample output of the aws command. efs host needs two columns: the IP outputted, and the hostname in $MOUNT_SOURCE variable defined outside the snipped I added)
– Carmageddon
4 hours ago
Yes but is this really adding the IP address to your
/etc/hosts? It seems more likely it is just adding the literal numbers0and1to it.– Jesse_b
4 hours ago
@Jesse_b yes it works, already tested on AWS deployment. Why do you think it should output just 0 and 1?
– Carmageddon
4 hours ago
1
No I'm saying that when an array is called with the
$!name[@]syntax it will expand to a list of the indices (0 1 2 3, etc) and not the elements (ip1 ip2 ip3, etc).– Jesse_b
4 hours ago