printenv

Print all environment variables

$ printenv

$ printenv [HOME]

$ printenv [PATH] [USER] [SHELL]

$ printenv -0

printenv [options] [variable...]

printenv prints the values of environment variables. When called without arguments, it prints all environment variables. When given variable names as arguments, it prints only those values.
Unlike `echo $VAR`, printenv shows nothing (and returns non-zero) for undefined variables, making it useful for testing variable existence in scripts.
printenv is part of GNU coreutils and provides a straightforward way to inspect the shell environment.

-0, --null

End each line with NUL instead of newline.

Display help information.

Display version information.

Only shows exported environment variables, not shell-local variables. For shell variables, use `echo $VAR` or `set` command. Variable names are case-sensitive.

printenv has been part of Unix systems since BSD 4.2 in 1983. The GNU version is part of coreutils. It provides a portable way to access environment variables across different shells.

env(1), export(1), set(1)