RunAs - explaining example from the docs

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john_c
Posts: 175
Joined: 05 May 2017, 13:19

RunAs - explaining example from the docs

20 Jul 2018, 17:01

Here is an example from the docs. I'm trying to understand what RegExMatch(full_command_line, " /restart(?!\S)") is doing. I tested this code and it seems we could simply remove RegExMatch part without any difference in the behaviour. But probably I miss something?

https://autohotkey.com/docs/commands/Run.htm#RunAs:

Code: Select all

full_command_line := DllCall("GetCommandLine", "str")
if not (A_IsAdmin or RegExMatch(full_command_line, " /restart(?!\S)"))
{
    try
    {
        if A_IsCompiled
            Run *RunAs "%A_ScriptFullPath%" /restart
        else
            Run *RunAs "%A_AhkPath%" /restart "%A_ScriptFullPath%"
    }
    ExitApp
}
MsgBox A_IsAdmin: %A_IsAdmin%`nCommand line: %full_command_line%
Last edited by john_c on 20 Jul 2018, 17:21, edited 1 time in total.
User avatar
gregster
Posts: 1393
Joined: 30 Sep 2013, 06:48

Re: RunAs - explaining example from the docs

20 Jul 2018, 17:13

https://autohotkey.com/docs/commands/Run.htm#RunAs:
If UAC is disabled, *RunAs will launch the process without elevating it. Checking for /restart in the command line ensures that the script does not enter a runaway loop in that case.
As I understand it, it prevents an endless re-start loop, if the restart with elevated rights failed (because of disabled UAC) the first time (if it was restarted by this snippet, the /restart string will appear in the command line, compare the RunAs lines). If it could not fail, it could probably be left out.

Ps.: Would be cool next time, if you could directly link to the doc page where you took it from.

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