env:tldr:5c45c

This command is used to set an environment variable and then execute a program with that variable's value.

Here's a breakdown of each component:

• env: It is a command in Unix-like operating systems that allows you to modify the environment variables for a specific command or script. It launches the specified command within an altered environment.

• ${variable}=${value}: This is the syntax for assigning a value to a variable in Unix-like operating systems. You replace ${variable} with the name of the variable you want to set, and ${value} with the desired value. For example, if you want to set a variable named NAME to the value John, you would write NAME=John.

• ${program}: This is the placeholder for the program or command you want to execute. You replace ${program} with the actual name of the program you want to run.

By combining these components, the env command is used to modify the environment temporarily by setting a specific variable to a desired value, and then executing a program within that modified environment.

For example, let's say you have a variable named MYVAR with the value 123, and a program named myprogram. To execute myprogram with MYVAR set to 123, you would write:

env MYVAR=123 myprogram

This command sets the environment variable MYVAR to 123 and then runs myprogram with that modified environment.