commandOS()

def commandOS(commandStr):
    # by: D@CC
    # date: 2020
    # used by: PiR2
    # version: na
    # aka: osCommand()  one should be deprecated
    # articles: 155,174,190,211,215
    # SSD/uSD: _KIOXIA_GTLL
    # @purpose: to issue a system command and return the result
    # @param1:  str commandStr       eg: "vcgencmd measure_temp"
    # @returns: str commandResultStr eg: "temp=36.9'C"
    # example: strReturn=commandOS("vcgencmd measure_temp")
    # uses: system
    #       name
    #       remove
    #       tiime
    #       sleep
    #       file: "/home/pi/Desktop/PiR2/files/commandResult.txt"
    
    from subprocess import call
    #import os
    from os import system, name, remove
    from time import sleep

#print("commandOS received commandStr:"+commandStr)
    commandResultStr="none"

global g_fileArray

#commandRFileName=g_fileArray[2]
    commandRFileName="/home/pi/Desktop/PiR2/files/commandResult.txt"
    # name is not a function, but a special variable
    if name == 'nt':
        _ =system('cls')
    else:
        if (commandStr=="clear"):

print("before clear")
            _= system("clear")
            print("after clear")
        else:
            if (False):
                # in case no file exists, appending something will create it
                # for sure
                fh=open(commandRFileName, "a")
                fh.write("any")
                fh.close()
                # now remove it
                remove(commandRFileName)
            #endif

# save result in txt file
            saveOutputStr=" >"+commandRFileName
            revisedCommandStr=commandStr+saveOutputStr
            #print("revisedCommandStr:"+revisedCommandStr)

#invoke system command
            _= system(revisedCommandStr)
            fh=open(commandRFileName, "r")
            # read the result of the command
            commandResultStr=fh.readline()
            fh.close()
        #end if
    return commandResultStr
    #end if
#end commandOS.txt

-- end of commandOS.py program in 04

Purpose: execute an OS command and return results
Form: commandOS(strCmd) -> strResult
Reason: permit code to execute OS command and use results
Summary: executes an OS command, saves results, returns results
Example: strD=commandOS("dir") will return list of dir contents
Help: type commandOS("-h") for help
Warning 1: Parm1 must be a str containing an OS command
Note 1: error checking prevents system errors.
Requires:

from ix_all import commandOS
Python Verson: 3
Globals: none
External Functions:
Imports: none
Classes: none
Files: temp result file

Version: none
For: PiR2 Area Controller and MakPiADC
Repository: ix_all.py Function Library
Author: D@CC ( David@ColeCanada.com )
Date Created : 2021FJun26
Date Tested : 2021FJun26
Date Modified: 2021FJun26
Source: www na on 20xxZmmm##
Code: commandOS() by D@CC (David at ColeCanada.com)

#/selectCode_commandOS_macro.py.txt