env

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

• 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