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Top Forums Programming Hiding commnd line arguments in ps command on Linux Post 302904619 by shriashishpatil on Thursday 5th of June 2014 07:58:18 AM
Old 06-05-2014
Hiding commnd line arguments in ps command on Linux

Hi Unix lovers,

I am trying to seek an explanation for a simple looking code - why it works?

I found below program which hide command line argument in ps command.

Code:
#include <string.h>

int main(int argc, char **argv)
{
    // process command line arguments....

    // hide command line arguments
    if (argc > 1) {
        char *arg_end;    
        arg_end = argv[argc-1] + strlen (argv[argc-1]);
        *arg_end = ' ';
    }

    // ...
}

The program can be found at
security - How does ps know to hide passwords? - Unix & Linux Stack Exchange

Can anyone explain why and how this code works? I am finding it hard to understand Smilie.

I ran this program on linux. Not sure if it works on solaris,hp etc..

Thanks in advance,

-Ashish
 

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Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_Main - main program for Tk-based applications SYNOPSIS
#include <tk.h> Tk_Main(argc, argv, appInitProc) ARGUMENTS
int argc (in) Number of elements in argv. char *argv[] (in) Array of strings containing command-line arguments. Tcl_AppInitProc *appInitProc (in) Address of an application-specific initialization procedure. The value for this argument is usually Tcl_AppInit. _________________________________________________________________ DESCRIPTION
Tk_Main acts as the main program for most Tk-based applications. Starting with Tk 4.0 it is not called main anymore because it is part of the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems. Having main in the Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions. Normally each application contains a small main function that does nothing but invoke Tk_Main. Tk_Main then does all the work of creating and running a wish-like application. When it is has finished its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc argument. This procedure provides a "hook" for the application to perform its own initialization, such as defining application-specific commands. The procedure must have an interface that matches the type Tcl_AppInitProc: typedef int Tcl_AppInitProc(Tcl_Interp *interp); AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit. KEYWORDS
application-specific initialization, command-line arguments, main program Tk 4.0 Tk_Main(3)
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