NSLog(@"myString is :%@", myString);
int processID = [myString intValue];

NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: @"/bin/ps"];

arguments = [NSArray arrayWithObjects: @"aux", [NSString stringWithFormat:@"%i", processID],nil];

[task setArguments: arguments];

NSPipe *pipe;
pipe = [NSPipe pipe];
//[task setStandardOutput: pipe];
[task setStandardOutput:pipe];

NSFileHandle *file;
file = [pipe fileHandleForReading];

[task launch];

NSData *data;
data = [file readDataToEndOfFile];

NSString *string;
string = [[NSString alloc] initWithData: data
                               encoding: NSUTF8StringEncoding];

//  NSLog(@"%@",string);


NSArray *lines= [string componentsSeparatedByString:@"n"];

NSString *lastline = [lines objectAtIndex:[lines count]-2];
//  NSLog(@"%@",lastline);



lines2= [lastline componentsSeparatedByString:@" "];
NSLog(@"%@",lines2);
for (int i=0; i<[lines2 count]; i++) {

    if([[lines2 objectAtIndex:i] isEqualToString:@""]){
        [lines2 removeObjectAtIndex:i];
    }

}
for (int i=0; i<[lines2 count]; i++) {

    if([[lines2 objectAtIndex:i] isEqualToString:@""]){
        [lines2 removeObjectAtIndex:i];
    }

}
for (int i=0; i<[lines2 count]; i++) {

    if([[lines2 objectAtIndex:7] isEqualToString:@"Ss"]){
        [[lines2 objectAtIndex:0] replaceObjectAtIndex:7 withObject:@"SS (Running)"];

    }
}

- (NSArray *)componentsSeparatedByString:(NSString *)separator

[[lines2 objectAtIndex:0] replaceObjectAtIndex:7 withObject:@"SS (Running)"];
 ^^^^^^^^^^^^^^^^^^^^^^^^ This is wrong

NSMutableArray * myMutableArray = [NSMutableArray arrayWithArray:lines2];