echo names and values of all env variables that start with “nlu_setting”

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I am looking for a way to echo names and values of all env variables that start with nlu_setting, so the output might look like:



nlu_setting_json=true
nlu_setting_global=0
nlu_setting_bar=foo


does anyone know how to do this?




bash shell shell-indirection indirection




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  • Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
    – JdeBP
    2 days ago
















up vote
-1
down vote

favorite












I am looking for a way to echo names and values of all env variables that start with nlu_setting, so the output might look like:



nlu_setting_json=true
nlu_setting_global=0
nlu_setting_bar=foo


does anyone know how to do this?




bash shell shell-indirection indirection




share|improve this question



















  • Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
    – JdeBP
    2 days ago












up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











I am looking for a way to echo names and values of all env variables that start with nlu_setting, so the output might look like:



nlu_setting_json=true
nlu_setting_global=0
nlu_setting_bar=foo


does anyone know how to do this?




bash shell shell-indirection indirection




share|improve this question











I am looking for a way to echo names and values of all env variables that start with nlu_setting, so the output might look like:



nlu_setting_json=true
nlu_setting_global=0
nlu_setting_bar=foo


does anyone know how to do this?





bash shell shell-indirection indirection





share|improve this question










share|improve this question




share|improve this question









asked 2 days ago









Alexander Mills

1,834929




1,834929











  • Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
    – JdeBP
    2 days ago
















  • Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
    – JdeBP
    2 days ago















Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
– JdeBP
2 days ago




Environment variables? Or shell variables? The difference is important, as it rules in/out several answers.
– JdeBP
2 days ago










2 Answers
2






active

oldest

votes

















up vote
2
down vote



accepted










for var in "$!nlu_setting_@"; do
 printf '%s=%sn' "$var" "$!var"
done


The expansion $!nlu_setting@ is a bash-specific expansion that returns a list of variable names matching a particular prefix. Here we use it to as for all names that start with the string nlu_setting_. We loop over these names and output the name along with the value of that variable.



We get the value of the variable using variable indirection ($!var).






share|improve this answer























  • do you think this is better than the compgen solution?
    – Alexander Mills
    2 days ago










  • @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
    – Kusalananda
    2 days ago











  • ah yes good point
    – Alexander Mills
    2 days ago

















up vote
0
down vote













After looking at the answers to this question, I came up with this:



 compgen -A variable | grep "nlu_setting_" | while read v; do
 echo "$v = $!v";
 done


it seems to work. Never heard of the compgen command, but if it's universal bash built-in, it should be all good..






share|improve this answer





















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    2 Answers
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    active

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    2 Answers
    2






    active

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    oldest

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    up vote
    2
    down vote



    accepted










    for var in "$!nlu_setting_@"; do
     printf '%s=%sn' "$var" "$!var"
    done


    The expansion $!nlu_setting@ is a bash-specific expansion that returns a list of variable names matching a particular prefix. Here we use it to as for all names that start with the string nlu_setting_. We loop over these names and output the name along with the value of that variable.



    We get the value of the variable using variable indirection ($!var).






    share|improve this answer























    • do you think this is better than the compgen solution?
      – Alexander Mills
      2 days ago










    • @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
      – Kusalananda
      2 days ago











    • ah yes good point
      – Alexander Mills
      2 days ago














    up vote
    2
    down vote



    accepted










    for var in "$!nlu_setting_@"; do
     printf '%s=%sn' "$var" "$!var"
    done


    The expansion $!nlu_setting@ is a bash-specific expansion that returns a list of variable names matching a particular prefix. Here we use it to as for all names that start with the string nlu_setting_. We loop over these names and output the name along with the value of that variable.



    We get the value of the variable using variable indirection ($!var).






    share|improve this answer























    • do you think this is better than the compgen solution?
      – Alexander Mills
      2 days ago










    • @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
      – Kusalananda
      2 days ago











    • ah yes good point
      – Alexander Mills
      2 days ago












    up vote
    2
    down vote



    accepted







    up vote
    2
    down vote



    accepted






    for var in "$!nlu_setting_@"; do
     printf '%s=%sn' "$var" "$!var"
    done


    The expansion $!nlu_setting@ is a bash-specific expansion that returns a list of variable names matching a particular prefix. Here we use it to as for all names that start with the string nlu_setting_. We loop over these names and output the name along with the value of that variable.



    We get the value of the variable using variable indirection ($!var).






    share|improve this answer















    for var in "$!nlu_setting_@"; do
     printf '%s=%sn' "$var" "$!var"
    done


    The expansion $!nlu_setting@ is a bash-specific expansion that returns a list of variable names matching a particular prefix. Here we use it to as for all names that start with the string nlu_setting_. We loop over these names and output the name along with the value of that variable.



    We get the value of the variable using variable indirection ($!var).







    share|improve this answer















    share|improve this answer



    share|improve this answer








    edited 2 days ago


























    answered 2 days ago









    Kusalananda

    100k13199311




    100k13199311











    • do you think this is better than the compgen solution?
      – Alexander Mills
      2 days ago










    • @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
      – Kusalananda
      2 days ago











    • ah yes good point
      – Alexander Mills
      2 days ago
















    • do you think this is better than the compgen solution?
      – Alexander Mills
      2 days ago










    • @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
      – Kusalananda
      2 days ago











    • ah yes good point
      – Alexander Mills
      2 days ago















    do you think this is better than the compgen solution?
    – Alexander Mills
    2 days ago




    do you think this is better than the compgen solution?
    – Alexander Mills
    2 days ago












    @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
    – Kusalananda
    2 days ago





    @AlexanderMills I would say that it will be more efficient as it's not calling grep. Your solution would also pick up variable names that contain nlu_setting_ anywhere, not just at the start of the variable name (due to the non-anchored regular expression that you are using).
    – Kusalananda
    2 days ago













    ah yes good point
    – Alexander Mills
    2 days ago




    ah yes good point
    – Alexander Mills
    2 days ago












    up vote
    0
    down vote













    After looking at the answers to this question, I came up with this:



     compgen -A variable | grep "nlu_setting_" | while read v; do
     echo "$v = $!v";
     done


    it seems to work. Never heard of the compgen command, but if it's universal bash built-in, it should be all good..






    share|improve this answer

























      up vote
      0
      down vote













      After looking at the answers to this question, I came up with this:



       compgen -A variable | grep "nlu_setting_" | while read v; do
       echo "$v = $!v";
       done


      it seems to work. Never heard of the compgen command, but if it's universal bash built-in, it should be all good..






      share|improve this answer























        up vote
        0
        down vote










        up vote
        0
        down vote









        After looking at the answers to this question, I came up with this:



         compgen -A variable | grep "nlu_setting_" | while read v; do
         echo "$v = $!v";
         done


        it seems to work. Never heard of the compgen command, but if it's universal bash built-in, it should be all good..






        share|improve this answer













        After looking at the answers to this question, I came up with this:



         compgen -A variable | grep "nlu_setting_" | while read v; do
         echo "$v = $!v";
         done


        it seems to work. Never heard of the compgen command, but if it's universal bash built-in, it should be all good..







        share|improve this answer













        share|improve this answer



        share|improve this answer











        answered 2 days ago









        Alexander Mills

        1,834929




        1,834929






















             

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