I'm calling command line programs connected by pipes. All this works on Linux for sure.
My method:
protected String execCommand(String command) throws IOException {
String line = null;
if (command.length() > 0) {
Process child = Runtime.getRuntime().exec(command);
InputStream lsOut = child.getInputStream();
InputStreamReader r = new InputStreamReader(lsOut);
BufferedReader in = new BufferedReader(r);
String readline = null;
while ((readline = in.readLine()) != null) {
line = line + readline;
}
}
return line;
}
If I'm calling some cat file | grep asd, I'm getting the expected result. But not all commands works correctly. For example with this:
cat /proc/cpuinfo | wc -l
or this:
cat /proc/cpuinfo | grep "model name" | head -n 1 | awk -F":" '{print substr($2, 2, length($2))}
the method will return null. I'm guessing this problem depends on output formatting commands like head, tail, wc, etc. How I can work around this problem and get the final result of the output?