к нему test.txt с любым текстом, который будем искать


#!/usr/local/bin/python3

import sys, os, cgi, random, re
sys.stdout.buffer.write(b'Content-type: text/html;charset=utf-8\n\n')
os.dup2(1, 2)


def _print(text):
    sys.stdout.buffer.write(text.encode('utf8'))
    sys.stdout.flush()

def execute(command, silent=True):
    import subprocess

    device = open('/dev/null', 'w') if silent else None

    proc = subprocess.Popen(command, shell=True,
            stdout=device, stderr=device).wait()


form = cgi.FieldStorage()

_print('''
    <form method='get'>
    <input type='text' name='searchtext' size='5' />
    </form><hr />
    ''')

find = form.getvalue('searchtext') if 'searchtext' in form else ''
_print('Ищем текст: <b>%s</b><br />\n' % find)

bash = "grep --binary-files=text \"%s\" test.txt" % find
_print('command: %s<br />\n' % bash)

execute(bash, silent=False)