I want to get a list of all environment variables (shell variables? exported variables?) and their values at a given time, in zsh.
What is the proper way to do this?
2 Answers
It sounds like you want env
.
-
2This doesn't work for me. The
HOST
env is missing from the output ofenv
. On zsh I was able to list everything withset
.– ChrisDec 20, 2021 at 3:14 -
@Chris If
$HOST
is missing from env, then it's not an environment variable. Dec 22, 2021 at 17:18 -
2@ Chris (nice name!). Where's
echo $HOST
coming from? Is this some sort of zsh variable that's not an actual OS environment variable? For my purposes$HOST
exists and has the value I want, but it only appears inset
and notenv
.– ChrisJan 6, 2022 at 23:27 -
2@Chris
$HOST
is a zsh variable instantiated on startup which is not exported by default. Most variables are not environment variables unless you explicitlyexport
them. See zsh.sourceforge.io/Doc/Release/Parameters.html#index-HOST Jan 7, 2022 at 19:04
export
prints out the list of environment variables and their values. The values are quoted, the output of export
is suitable for reading back into the shell. The variables are printed in alphabetical order.
If you want shell variables as well, use set
. If you want shell variables with type annotations (exported
, integer
, etc.), use typeset
.
You can use export
and set
on other shells as well, but most don't quote the output, so it's not parseable. typeset
is available (with different behavior) on ksh and bash.
If you want the environment variables, there's also the env
command, which prints unsorted, unquoted
If you only want the names, access the parameters
associative array. The keys are the parameter names and the values indicate the types.
-
Some difference with
env
:env -i '$(reboot)=1' zsh -c export
(compare withbash
where you don't want to feed it back into the shell (fixed in 4.4)). Andenv -i zsh 'export foo; export'
. See also zsh.org/mla/workers/2016/msg01840.html and theenv -i zsh -c export
bug in recent versions of zsh which I've just reported. Sep 30, 2016 at 9:09 -
2See also
typeset -p +H -m '*'
to list all variables, including hidden ones. Sep 30, 2016 at 9:15
typeset -x
or equivalentlyexport
, or/usr/bin/env
(or justenv
if your$PATH
is set right, i.e contains/usr/bin:
)zsh
shell, I would recommend installing these plugins:alias-finder
,aliases
. To install append the mentioned plugin names in~/.zshrc
to the line describing plugins.env
andexport
are alsoe good options when combined withgrep
like thisexport | grep "git"