this one should be simple enough, maybe even for newbies. i would a script that is given a command in its arguments, prints the command to stderr, runs the command given to it, then if the given command it runs has an exit code different than zero, prints the exit code to stderr, then exits with the exit code of the given command it runs.
It's like reading the docs from subprocess...
#!/usr/bin/env python3
from subprocess import Popen, PIPE
import sys
args = sys.argv[1:]
print('Program:', args[0])
print('Arguments:', args[1:])
proc = Popen(args, shell=False, stdout=PIPE, stderr=PIPE)
stdout, stderr = proc.communicate()
exitcode = proc.wait()
print('Exitcode:', exitcode)
print('Stdout:', stdout.decode())
print('Stderr:', stderr.decode())
sys.exit(exitcode)This example prints always: program, arguments, exitcode, stdout, stderr
This program does not work with tools like midnight commander or screen.
i don't know about midnight commander, but, why would it not work with screen? oh, the output might not be seen until screen exits? my old bash version works with screen.
Midnight Commander, screen, tmux and bash are interactive programs which are modifying the terminal.
My example opens the process and then it uses the method communicate().
This is a blocking call until the process has been terminated.
Conclusion: This program would never show the output from an interactive process and it would not end.
then. the problem is that the user cannot interact with the program being run, when it is run that way. also consider the ping command. i think you will have a problem with that command, too, unless you use the -c option with a reasonably low number.
maybe you need to be using subprocess.call(sys.argv[1:]) to run the command.
In [1]: from scapy.all import IP, ICMP, sr1
WARNING: No route found for IPv6 destination : : (no default route?). This affects only IPv6
In [2]: packet = IP()
In [3]: packet.dst = '8.8.8.8'
In [4]: icmp = ICMP() # echo request
In [5]: response = sr1(packet/icmp)
Begin emission:
.Finished to send 1 packets.
*
Received 2 packets, got 1 answers, remaining 0 packets
In [6]: response
Out[6]: <IP version=4 ihl=5 tos=0x0 len=28 id=4349 flags= frag=0 ttl=59 proto=icmp chksum=0x3a29 src=8.8.8.8 dst=192.168.100.3 options= |<ICMP type=echo-reply code=0 chksum=0x0 id=0x0 seq=0x0 |>>