#p1 = processo corrente: python3 provaShell.py src dst dir
#p2 = grep -rl src dst
#p3 = xrgs sed -i ‘s/src/dst/g’
import subprocess
import sys
src = sys.argv[1]
dst = sys.argv[2]
dir = sys.argv[3]
p2 = subprocess.Popen(\
['grep', '-rl', src, dir],\
stdout=subprocess.PIPE,\
stderr=subprocess.PIPE)
p3 = subprocess.Popen(\
['xargs', 'sed', '-i', 's/' + src + '/' + dst + '/g'],\
stdout=subprocess.PIPE,\
stdin=p2.stdout)
stdout, stderr = p3.communicate()
#visualizzo l'elenco dei file appena modificati: grep -rl dst dir
p = subprocess.Popen(['grep', '-rl', dst, dir],\
stdout=subprocess.PIPE,\
stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
lista = stdout.decode("utf-8").split("\n")
for x in lista:
        print(x)