Start a linux command and read its standard output using QProcess

[arunkumaraymuo]

I am trying to read the output of a linux command using QProcess but its not given the correct output.

QProcess process;
 
    process.start("iwconfig 2>&1 | grep ESSID");
    process.waitForFinished();
    usleep(1000);
    QString output(process.readAllStandardOutput());
    qDebug()<<output;
 
    QString err(process.readAllStandardError());
    qDebug()<<err;

QProcess process;

    process.start("iwconfig 2>&1 | grep ESSID");
    process.waitForFinished();
    usleep(1000);
    QString output(process.readAllStandardOutput());
    qDebug()<<output;

    QString err(process.readAllStandardError());
    qDebug()<<err;

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In this code the qDebug()<<output; prints "" and
qDebug()<<err; prints "iwconfig: unknown command "|"
"
When I run this same command "iwconfig 2>&1 | grep ESSID" in terminal window its shown
wlan0 IEEE 802.11bgn ESSID:"Arun Kumar" Nickname:"<WIFI@REALTEK>"

Why my program printing "iwconfig: unknown command "|"", what is the error in my code and how I can correct this in my code?