[PYTHON] Run a local script on a remote host


Run bash and python scripts remotely, without modification, without copying files.


I want to run such a script



for arg in init ${@};do
    echo "$(date +%Y-%m-%dT%H:%M:%S) $(hostname) ${arg}"
    sleep 1
$ ./sample.sh a b c
2015-12-22T11:30:26 local-host init
2015-12-22T11:30:27 local-host a
2015-12-22T11:30:28 local-host b
2015-12-22T11:30:29 local-host c

Basic idea

1. With ssh, you can submit a script to stdin of a remote shell.

$ cat sample.sh | ssh user@remote-host
2015-12-22T11:31:43 remote-host init

2. bash can receive the contents of stdin as a file

$ cat sample.sh | bash <(cat -) a b c
2015-12-22T11:33:47 local-host init
2015-12-22T11:33:48 local-host a
2015-12-22T11:33:49 local-host b
2015-12-22T11:33:50 local-host c

3. With the here document, you can run the script without creating a file

$ cat << 'EOT' | bash <(cat -) a b c
> for arg in init ${@};do
>     echo "$(date +%Y-%m-%dT%H:%M:%S) $(hostname) ${arg}"
>     sleep 1
> done
2015-12-22T11:40:17 local-host init
2015-12-22T11:40:18 local-host a
2015-12-22T11:40:19 local-host b
2015-12-22T11:40:20 local-host c


Such a script


echo -e "cat << 'EOT' | bash <(cat -) ${@:2}\n$(cat ${1}|sed -e 's/\\/\\\\/g')\nEOT"


$ ./rdosh.sh sample.sh a b c | ssh user@remote-host
2015-12-22T11:42:48 remote-host init
2015-12-22T11:42:49 remote-host a
2015-12-22T11:42:50 remote-host b
2015-12-22T11:42:51 remote-host c

did it

python too

Such a script


#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import os
import time
for arg in ["init"]+sys.argv[1:]:
    sys.stdout.write("{0} {1} {2}\n".format(time.strftime("%Y-%m-%dT%H:%M:%S"),os.uname()[1],arg))


echo -e "cat << 'EOT' | python <(cat -) ${@:2}\n$(cat ${1}|sed -e 's/\\/\\\\/g')\nEOT"

python also worked

$ ./sample.py a b c
2015-12-22T13:20:29 local-host init
2015-12-22T13:20:30 local-host a
2015-12-22T13:20:31 local-host b
2015-12-22T13:20:32 local-host c
$ ./rdopy sample.py a b c | ssh user@remote-host
2015-12-22T13:20:46 remote-host init
2015-12-22T13:20:47 remote-host a
2015-12-22T13:20:48 remote-host b
2015-12-22T13:20:49 remote-host c

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