On 18 May 2010, at 21:13, Jens Alfke wrote:
>
> On May 18, 2010, at 12:33 PM, appledev wrote:
>
>> I dont want to use a call to a bash script, because of sneaking in bad
>> commands.
>
> As others said, it’s not a problem here because the command line is entirely
> hardcoded.
>
> If you wanted to avoid using a shell, you’d have to start three separate
> NSTasks for the three commands (df, grep, awk) and hook the output pipe of
> one to the input of the next. I’m not sure how to do that.
Something like the following should work, right?
NSTask *task1 = [[[NSTask alloc] init] autorelease];
NSTask *task2 = [[[NSTask alloc] init] autorelease];
NSTask *task3 = [[[NSTask alloc] init] autorelease];
NSPipe *t1t2pipe = [NSPipe pipe];
NSPipe *t2t3pipe = [NSPipe pipe];
NSPipe *outputPipe = [NSPipe pipe];
[task1 setLaunchPath:@"/bin/df"];
[task1 setArguments:[NSArray arrayWithObjects:@"-k", nil]];
[task1 setStandardOutput:t1t2pipe];
[task2 setLaunchPath:@"/usr/bin/grep"];
[task2 setArguments:[NSArray arrayWithObjects:@"/dev/", nil]];
[task2 setStandardInput:t1t2pipe];
[task2 setStandardOutput:t2t3pipe];
[task3 setLaunchPath:@"/usr/bin/awk"];
[task3 setArguments:[NSArray arrayWithObjects:@"{print $1 \"\t\" $4 \"\t\" $5
\"\t\" $6;}", nil]];
[task3 setStandardInput:t2t3pipe];
[task3 setStandardOutput:outputPipe];
[task1 launch];
[task2 launch];
[task3 launch];
Kind regards,
Alastair.
--
http://alastairs-place.net
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