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env

Show the environment or run a program in a modified environment. More information: https://www.gnu.org/software/coreutils/env.

Show the environment:

env

Run a program. Often used in scripts after the shebang (#!) for looking up the path to the program:

env {{program}}

Clear the environment and run a program:

env -i {{program}}

Remove variable from the environment and run a program:

env -u {{variable}} {{program}}

Set a variable and run a program:

env {{variable}}={{value}} {{program}}

Set one or more variables and run a program:

env {{variable1}}={{value}} {{variable2}}={{value}} {{variable3}}={{value}} {{program}}