How to replace command line argument of filename with python string of the equivalent file content

How to replace command line argument of filename with python string of the equivalent file content

By : Dougie McKeating
Date : November 19 2020, 01:01 AM
Does that help Using the subprocess module in python. The solution was as follows where command and txt_inp can be replaced. txt_inp is the textual content of the infilename above:
code :
import subprocess

txt_inp = 'some text as input'
process = subprocess.Popen('command', stdin=subprocess.PIPE, stdout=\
        subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
t_arr, t_err = process.communicate(input=txt_inp)
command < infilename > outfilename 

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Getting Short-Filename of Command-Line Argument from Batch-File

Getting Short-Filename of Command-Line Argument from Batch-File

By : user1734002
Date : March 29 2020, 07:55 AM
will help you Well I just confirmed it. I tested the script with CMD.EXE from XP SP1, SP2, and SP3 as well as an SP2 VM installation. It gave the aforementioned erroneous results with the SP1 version, but worked correctly in the SP2 and SP3 versions. So it is indeed a bug that was fixed. For anyone else who runs into this, the CMD.EXE file from SP2+ can be dropped into an SP1 installation without issue (assuming that an update is not feasible).
Passing a filename through a command-line argument vs. using a string literal in-code

Passing a filename through a command-line argument vs. using a string literal in-code

By : Jason Sperry
Date : March 29 2020, 07:55 AM
seems to work fine The following bit of code seems to interpret the slash in the passed filename differently, depending on whether it was passed as a command line argument, or hardcoded by means of a literal. If the image filename C:\kimba.jpg is passed in as a command line argument, it works fine: , You need to escape the backslash with a backslash:
code :
IplImage* img = cvLoadImage("C:\\kimba.jpg", 1);
Python: reading filename from command line argument

Python: reading filename from command line argument

By : Gagandeep singh
Date : March 29 2020, 07:55 AM
may help you . I am making a simple script that counts some values from a csv file generated from google forms. , In the end as mentioned the script should be this one:
code :
import csv
from sys import argv
import os.path

def readCsvAndCountPercentPerFormItemFromGoogleForms(fileName):
    with open(fileName,'r') as csvfile:


        for row in csvReader:


            if(value in times.values()):


        return calculateDictionaryAsPercent(times,totalRows)

def calculateDictionaryAsPercent(times,totalRows):

        raise ValueError("The file does not contain any rows")

    for key,val in times.items():

    return times

def isFile(fileName):
    if(not os.path.isfile(fileName)):
        raise ValueError("You must provide a valid filename as parameter")


if __name__=="__main__":
    except Exception as e:
        print("You must provide a valid filename as parameter")


print finalTimes
Passing in filename from command line to read file content

Passing in filename from command line to read file content

By : vivekprocoder
Date : March 29 2020, 07:55 AM
may help you . I have a function ./transform that needs to take in two command line arguments for an input and output file. , There are few issues with the code you tried, firstly here
code :
void main(FILE *inputFile, FILE *outputFile){ }
int main(void) { /* ... */ }
int main(int argc, char *argv[]) { /* ... */ }
int main(int argc, char *argv[]) {
    /*some_code */
token = fopen(&inputFile, "r");
FILE *fopen(const char *path, const char *mode);
int main(int argc, char *argv[]) {
  if( argc!= 3 ) { /*if user input is not correct, inform user */
     printf("./transform inputfile outputfile \n");
     return 0;
  FILE *fp = fopen(argv[1],"r); 
  if(fp == NULL) {
     /* error handling */
     return 0;
  /* do_stuff_with_fp */  
How to replace the text into a particular location of a file by passing the argument via command line argument

How to replace the text into a particular location of a file by passing the argument via command line argument

Date : March 29 2020, 07:55 AM
Hope this helps You can make replacements to a file in-place, but you should not do this in practice. You will likely corrupt the file if you attempt to replace characters and do not make an exact one-to-one replacement of characters already in the file.
To safely change the contents of a file, read the entire file contents into memory, make the changes needed, and then truncate the current file and write the new contents to the truncated file. (if the file is too large for in-memory operations, then use a temporary file)
code :
#include <stdio.h>
#include <string.h>

#define MAXSIZE 64          /* max line/buffer size */
#define FNAME "logic.txt"   /* default file name */
#define REPLACE "1567"      /* default replacement text */

int main (int argc, char **argv) {

    char buf[MAXSIZE] = "";         /* line buffer */
    const char *str = argc > 1 ? argv[1] : REPLACE; /* replacement string */
    int replaced = 0;               /* flag indicating replacement made */
    FILE *fp = fopen (FNAME, "r+"); /* open file reading/writing */

    if (!fp) {  /* validate file open for reading/writing */
        perror ("fopen-FNAME");
        return 1;

    while (fgets (buf, MAXSIZE, fp)) {  /* read each line in file */
        if (!replaced) {                /* if replacement not yet made */
            char *p = strchr (buf, '=');    /* search for '=' in line */
            if (p) {                        /* if found */
                size_t plen = 0;            /* var for length to end */
                p++;                        /* advance past '=' sign */
                plen = strlen (p);          /* get length to end  */

                if (plen < strlen (str)) {  /* check avail length */
                    fprintf (stderr, "error: not enough space in line.\n");
                    return 1;
                strcpy (p, str);                    /* copy str to p */
                if (fseek (fp, -plen, SEEK_CUR)) {  /* backup plen chars */
                    perror ("fseek(fp)");
                    return 1;
                fputs (p, fp);  /* overwite contents with replacement */
                replaced = 1;   /* set flag indicating replacement   */
            }                   /* (you can break, and remove output */
        }                       /*  here if not writing to stdout)   */
        fputs (buf, stdout);    /* output lines to stdout (optional) */
    if (fclose (fp) == EOF)     /* always validate close-after-write */
        perror ("fclose-FNAME");

    return 0;
$ cat logic.txt

$ ./filelogic

$ cat logic.txt

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