问题
Is it possible to list all environment variables from a Windows' command prompt?
Something equivalent to PowerShell's gci env: (or ls env: or dir env:).
回答1:
Just do:
SET
You can also do SET prefix to see all variables with names starting with prefix.
For example, if you want to read only derbydb from the environment variables, do the following:
set derby
...and you will get the following:
DERBY_HOME=c:\Users\amro-a\Desktop\db-derby-10.10.1.1-bin\db-derby-10.10.1.1-bin
回答2:
Jon has the right answer, but to elaborate a little more with some syntactic sugar..
SET | more
enables you to see the variables one page at a time, rather than the whole lot, or
SET > output.txt
sends the output to a file output.txt which you can open in Notepad or whatever...
回答3:
To list all environment variables in PowerShell:
Get-ChildItem Env:
Or as suggested by user797717 to avoid output truncation:
Get-ChildItem Env: | Format-Table -Wrap -AutoSize
Source: Creating and Modifying Environment Variables (Windows PowerShell Tip of the Week)
回答4:
Simply run set from cmd.
Displays, sets, or removes environment variables. Used without parameters, set displays the current environment settings.
回答5:
You can use SET in cmd
To show the current variable, just SET is enough
To show certain variable such as 'PATH', use SET PATH.
For help, type set /?.
回答6:
Don't lose time. Search for it in the registry:
reg query "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment"
returns less than the SET command.
回答7:
If you want to see the environment variable you just set, you need to open a new command window.
Variables set with setx variables are available in future command windows only, not in the current command window. (Setx, Examples)
回答8:
As mentioned in other answers, you can use set to list all the environment variables or use
set [environment_variable] to get a specific variable with its value.
set [environment_variable]= can be used to remove a variable from the workspace.
来源：https://stackoverflow.com/questions/5327495/list-all-environment-variables-from-the-command-line