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You need double quote " for command in system().

ready4u(就等你了)

Here is my example:

open(HWIDS,"devid.txt") or die !;
while  {
    print  "About to disable the device $_,\\n");
    system("devcon disable $_");  #<--------- err line
}
close(HWIDS);

Another option, you can use ` to issue the system command and get the result back.

use strict;  #good habit to use this.
my $output;
open(HWIDS,"devid.txt") or die !;
while  {
    print  "About to disable the device $_,\\n");
    $output = `devcon disable $_`;
    print "Result:\\n", $output;
}
close(HWIDS);

(#5978987@0)
Last Updated: 2010-3-30
This post has been archived. It cannot be replied.

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工作学习 / 学科技术讨论 / Perl programming question -redspider(红蜘蛛); 2010-3-22 {433} (#5961477@0)
******************
open (HWIDS,"devid.txt") or die !;
while <HWIDS> {
system(devcon disable $_); <--------- err line
}
close(HWIDS);
******************

devcon disable is windows command for disabling hardware in system.

i got something like "can't locate object method devcon via package disable..."

doing my $result = `devcon disable $_` get what i want but i do not need any return...

someone has any idea?

try: system("devcon disable $_"); -newstart12(pundit); 2010-3-24 (#5966300@0)

I did, same error... -redspider(红蜘蛛); 2010-3-24 (#5966659@0)

system("/bin/ls -l /var/tmp"); works on unix. don't know why your command doesn't work -newstart12(pundit); 2010-3-25 (#5969174@0)

my though -redspider(红蜘蛛); 2010-3-25 {356} (#5970260@0)
i am not sure what i say

i think it is because after command Devcon, there is sub-command Disable, you can't find this kind of command under unix or linux, but under windows, this is quite common.

if i write system (dir c:), it will work because there is not sub-command after dir.

but i still doubt that Perl can not handle this kind of command.

path -buma(。。。。); 2010-3-25 (#5969196@0)

i tried, no luck. -redspider(红蜘蛛); 2010-3-25 (#5970246@0)

u sure u can run devcon disable via cmd line without referring to the full path leading to devcon thou? -buma(。。。。); 2010-3-25 (#5970331@0)

yes. -redspider(红蜘蛛); 2010-3-26 {203} (#5971959@0)
i already put it in system32 et put it in same directory as perl script. if not, `devcon disable $_` will not work either, right?

the error indicate it found devcon but can not interpret it in script.

I may be wrong, but you can either assign to a variable the whole command string with subcommand and argument(s), then do system($myvar); or invoke command in array mode like system("devcon", "disable", $_); -u1a037(马鸭树); 2010-3-28 (#5975159@0)

i did tried the first method, got same error, i will try the array mode monday. thanks. -redspider(红蜘蛛); 2010-3-28 (#5975502@0)

if hardware id contains special chars (it usually does), be sure to escape them well such as \. -u1a037(马鸭树); 2010-3-28 {290} (#5975546@0)
my modem hw id is PCI\VEN_1057&DEV_5600&SUBSYS_03001436&REV_00, I can disable/enable in perl.

F:\MyC>perl dev1.pl
PCI\VEN_1057&DEV_5600&SUBSYS_03001436&REV_00\3&61AAA01&0&70 : Enabled on reboot
Not all of 1 device(s) enabled, at least one requires reboot to complete the operation.

no luck either for array mode, but i did not escape the special char in device line. i do not understand why it works with backticks but not system function. -redspider(红蜘蛛); 2010-3-30 (#5979438@0)

almost certain your " is overloaded. -u1a037(马鸭树); 2010-3-30 (#5980197@0)

You need double quote " for command in system(). -ready4u(就等你了); 2010-3-30 {580} (#5978987@0)

Here is my example:

open(HWIDS,"devid.txt") or die !;
while  {
    print  "About to disable the device $_,\\n");
    system("devcon disable $_");  #<--------- err line
}
close(HWIDS);

Another option, you can use ` to issue the system command and get the result back.

use strict;  #good habit to use this.
my $output;
open(HWIDS,"devid.txt") or die !;
while  {
    print  "About to disable the device $_,\\n");
    $output = `devcon disable $_`;
    print "Result:\\n", $output;
}
close(HWIDS);

thanks for advice, i will keep backticks method to get device enable or disable. -redspider(红蜘蛛); 2010-3-30 (#5979445@0)

@Florida

You need double quote " for command in system().

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