I have rewrited my code as follow, but it still not working. import os, sys
pid = os.fork()
if pid == 0:
os.execvp("du",("du","-shc","/usr/share"))
else:
while 1:
try:
os.kill(pid,0)
sys.stdout.write('running')
sys.stdout.flush()
sys.stdout.write('\b\b\b\b\b\b\b')
except OSError:
print "child ended"
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