Tips using linux

2017-02-01

TipsLinux

Linux

Tips using linux

Upload & download files using SCP

local sever -> remote server

1	scp abc@111.222.333.444:/home/abc/* /home/me/

remote sever -> local server

1	scp /home/me/ abc@111.222.333.444:/home/abc/*

in case of using other port as SSH

1	scp -P 2222 abc@1.2.3.4:/home/abc/* /home/me/

List all files

including folders
1
find .
excluding folders
1
find . -type f

다른 계정으로 bash 명령 실행하기

계정 이름, host 주소만 필요할 경우
1
ssh [id]@[host] [command]

password도 필요한 경우

1	sshpass -p [password] ssh [id]@[host] [command]

bash error handling

error 발생시 스크립트 종료하기

1	[bash_command] \|\| [error_handling_function]

example

function error_exit
{
    echo "$1" 1>&2
    exit 1
}
# [bash_command] || error_exit [error_message]
cd $some_directory || error_exit "Cannot change directory!  Aborting."

Using bash script on python

simple way without a return value
1
2
import os, sys
os.system("ls -al")

the way with a return value (printed value)

import subprocess
def bashcmd (cmd, isPrint=True):
    result = subprocess.check_output(cmd, shell=True)
    print result.decode("utf-8")
bashcmd ('ls -al')

in case of python < 2.7

import subprocess
if "check_output" not in dir( subprocess ): # duck punch it in!
    def f(*popenargs, **kwargs):
        if 'stdout' in kwargs:
            raise ValueError('stdout argument not allowed, it will be overridden.')
        process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
        output, unused_err = process.communicate()
        retcode = process.poll()
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
            raise subprocess.CalledProcessError(retcode, cmd)
        return output
    subprocess.check_output = f

def bashcmd (cmd, isPrint=True):
    result = subprocess.check_output(cmd, shell=True)
    print result.decode("utf-8")

bashcmd ('ls -al')