Find all environment variables with the same value-CodePudding

I'm on a linux machine in the command line. I would like to find all of the environment variables with same value.

In my hypothetical/simplified example, let's imagine I run the command printenv and that gives me the output of:

SHELL=/bin/bash
GOOGLE_CLOUD_SHELL=true
GOOGLE_CLOUD_PROJECT=qwiklabs-gcp-04-331618d6c19
JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
CLOUD_SHELL=true
DEVSHELL_PROJECT_ID=qwiklabs-gcp-04-331618d6c19
GCLOUD_PROJECT=qwiklabs-gcp-04-331618d6c19

I am trying to find redundant environment variables. I would like a command that shows me all of the environment variables with the value of qwiklabs-gcp-04-331618d6c19. So I would like a command to show me this output:

GOOGLE_CLOUD_PROJECT=qwiklabs-gcp-04-331618d6c19
DEVSHELL_PROJECT_ID=qwiklabs-gcp-04-331618d6c19
GCLOUD_PROJECT=qwiklabs-gcp-04-331618d6c19

I would also be happy with this output:

GOOGLE_CLOUD_PROJECT
DEVSHELL_PROJECT_ID
GCLOUD_PROJECT

How can I do this?

CodePudding user response：

If all the variables are listed in the output of printenv then:

awk -v value='qwiklabs-gcp-04-331618d6c19' '
    BEGIN {
        for (e in ENVIRON)
            if (ENVIRON[e]==value)
                print e
    }
'

CodePudding user response：

for i in `env | cut -d= -f 2- | sort | uniq -d`; do env | grep "$i";done | cut -d= -f1

This will have some issues with variables containing spaces

CodePudding user response：

This answer addresses this part of the question:

I would like to find all of the environment variables with same value

As I've been diving into jq lately:

jq -rn '
    $ENV 
    | to_entries 
    | group_by(.value)[]
    | select(length > 1)[]
    | "\(.key)=\(.value | @sh)"
'

Will output, amongst any other sets of env vars that share values:

GOOGLE_CLOUD_PROJECT='qwiklabs-gcp-04-331618d6c19'
DEVSHELL_PROJECT_ID='qwiklabs-gcp-04-331618d6c19'
GCLOUD_PROJECT='qwiklabs-gcp-04-331618d6c19'
GOOGLE_CLOUD_SHELL='true'
CLOUD_SHELL='true'

For that specific value:

jq -rn --arg value qwiklabs-gcp-04-331618d6c19 '
    $ENV
    | to_entries[]
    | select(.value == $value)
    | "\(.key)=\(.value | @sh)"
'

CodePudding user response：

I would like a command that shows me all of the environment variables with the value of qwiklabs-gcp-04-331618d6c19

Most probably I would just do:

env -0 | grep -zx '[^=]*=qwiklabs-gcp-04-331618d6c19' | tr '\0' '\n'