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Why is my GID environment variable empty?


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0















I try echo $GID but get nothing. However, I can get 1000 by using id -g, what's the differences between them ?



id -u     => 1000
id -g => 1000
echo $UID => 1000
echo $GID =>


The output of id:



uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare),999(docker)


The output of groups:



user adm cdrom sudo dip plugdev lpadmin sambashare docker


Ubuntu version:



Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial









share|improve this question





























    0















    I try echo $GID but get nothing. However, I can get 1000 by using id -g, what's the differences between them ?



    id -u     => 1000
    id -g => 1000
    echo $UID => 1000
    echo $GID =>


    The output of id:



    uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare),999(docker)


    The output of groups:



    user adm cdrom sudo dip plugdev lpadmin sambashare docker


    Ubuntu version:



    Distributor ID: Ubuntu
    Description: Ubuntu 16.04.6 LTS
    Release: 16.04
    Codename: xenial









    share|improve this question



























      0












      0








      0








      I try echo $GID but get nothing. However, I can get 1000 by using id -g, what's the differences between them ?



      id -u     => 1000
      id -g => 1000
      echo $UID => 1000
      echo $GID =>


      The output of id:



      uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare),999(docker)


      The output of groups:



      user adm cdrom sudo dip plugdev lpadmin sambashare docker


      Ubuntu version:



      Distributor ID: Ubuntu
      Description: Ubuntu 16.04.6 LTS
      Release: 16.04
      Codename: xenial









      share|improve this question
















      I try echo $GID but get nothing. However, I can get 1000 by using id -g, what's the differences between them ?



      id -u     => 1000
      id -g => 1000
      echo $UID => 1000
      echo $GID =>


      The output of id:



      uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare),999(docker)


      The output of groups:



      user adm cdrom sudo dip plugdev lpadmin sambashare docker


      Ubuntu version:



      Distributor ID: Ubuntu
      Description: Ubuntu 16.04.6 LTS
      Release: 16.04
      Codename: xenial






      environment-variables groups uid






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 6 mins ago









      PRY

      293213




      293213










      asked 34 mins ago









      CoreyCorey

      10515




      10515






















          1 Answer
          1






          active

          oldest

          votes


















          1














          I assume you're using bash as your shell. Bash doesn't set a GID variable. The list of Bash variables mentions EUID and UID, but not GID.



          Zsh, on the other hand, does set GID:



          $ bash -c 'echo $GID'

          $ zsh -c 'echo $GID'
          1000





          share|improve this answer
























          • What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

            – Corey
            7 mins ago











          • @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

            – Olorin
            2 mins ago











          • Got it, thanks. Is there any way in bash to get GID except id -g ?

            – Corey
            52 secs ago











          Your Answer








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          1 Answer
          1






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

          votes









          1














          I assume you're using bash as your shell. Bash doesn't set a GID variable. The list of Bash variables mentions EUID and UID, but not GID.



          Zsh, on the other hand, does set GID:



          $ bash -c 'echo $GID'

          $ zsh -c 'echo $GID'
          1000





          share|improve this answer
























          • What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

            – Corey
            7 mins ago











          • @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

            – Olorin
            2 mins ago











          • Got it, thanks. Is there any way in bash to get GID except id -g ?

            – Corey
            52 secs ago
















          1














          I assume you're using bash as your shell. Bash doesn't set a GID variable. The list of Bash variables mentions EUID and UID, but not GID.



          Zsh, on the other hand, does set GID:



          $ bash -c 'echo $GID'

          $ zsh -c 'echo $GID'
          1000





          share|improve this answer
























          • What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

            – Corey
            7 mins ago











          • @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

            – Olorin
            2 mins ago











          • Got it, thanks. Is there any way in bash to get GID except id -g ?

            – Corey
            52 secs ago














          1












          1








          1







          I assume you're using bash as your shell. Bash doesn't set a GID variable. The list of Bash variables mentions EUID and UID, but not GID.



          Zsh, on the other hand, does set GID:



          $ bash -c 'echo $GID'

          $ zsh -c 'echo $GID'
          1000





          share|improve this answer













          I assume you're using bash as your shell. Bash doesn't set a GID variable. The list of Bash variables mentions EUID and UID, but not GID.



          Zsh, on the other hand, does set GID:



          $ bash -c 'echo $GID'

          $ zsh -c 'echo $GID'
          1000






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 17 mins ago









          OlorinOlorin

          2,631924




          2,631924













          • What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

            – Corey
            7 mins ago











          • @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

            – Olorin
            2 mins ago











          • Got it, thanks. Is there any way in bash to get GID except id -g ?

            – Corey
            52 secs ago



















          • What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

            – Corey
            7 mins ago











          • @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

            – Olorin
            2 mins ago











          • Got it, thanks. Is there any way in bash to get GID except id -g ?

            – Corey
            52 secs ago

















          What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

          – Corey
          7 mins ago





          What's the differences between using bash -c 'echo $GID' and echo $GID in terminal ?

          – Corey
          7 mins ago













          @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

          – Olorin
          2 mins ago





          @Corey echo $GID in my terminal would run it in zsh, since I use zsh as my shell. In your terminal, it might be run in bash. I use bash -c ... to run the command specifically in bash.

          – Olorin
          2 mins ago













          Got it, thanks. Is there any way in bash to get GID except id -g ?

          – Corey
          52 secs ago





          Got it, thanks. Is there any way in bash to get GID except id -g ?

          – Corey
          52 secs ago


















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