I opened the /etc/environment and added the line ANDROID_SDK_HOME="/home/tom/android-sdk" but I tried echo $ANDROID_SDK_HOME but displayed nothing. I have JAVA_HOME in the same /etc/environment but its working. Please help me fix the problem. Thanks in advance.

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    I'm guessing the file never gets opened yet. Run source /etc/environment from a command line and echo the variable again. – Anko Mar 12 '13 at 0:52
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    I'm happy I helped. TheKoju's answer is a more permanent fix -- accept that one. – Anko Mar 12 '13 at 1:10
  • Isn't the main difference that /etc/environment is system wide and /home/nobody/.profile is specific to the user nobody? Both should be persistent / permanent. Both approaches have their place – xeraa Aug 8 '13 at 0:23

Environment variables can be defined permanently by editing the .profile file in your home directory. Here's how:

Edit your .profile file with a command like gedit ~/.profile. Append this to the end of the file:

export ANDROID_SDK_HOME=/home/tom/android-sdk

You can source .profile to make it apply right away. Each time you restart your system, the .profile file is loaded, restoring this setting.

| improve this answer | |

Its not recommended to use .profile file anymore to store user specific environment variables.

Use ~/.pam_environment file instead.

See: https://help.ubuntu.com/community/EnvironmentVariables

| improve this answer | |

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