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Asked: 2026-05-31T20:49:59+00:00

Just as a learning experience, I’m trying to code the following problems in C.

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Just as a learning experience, I’m trying to code the following problems in C.

If two flash drives are inserted each having a folder (say,
Course_Notes), then they get synced. That is, data is copied from one
to the other and if there a file already exists, then the newer one is
retained.

I would do this in bash by:

#!/bin/bash
while $1
do
cp -ur /media/PD_1/Course_Notes /media/PD_2/Course_Notes
cp -r /media/PD_2/Course_Notes /media/PD_1/Course_Notes
done

How do I do this in C without too many system calls ?

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1 Answer

  1. Editorial Team

    In the real world, you’d probably use something like rsync for this.

    You’re probably looking for the stat() family of functions to get size and modification date, along with opendir()/readdir()/closedir() for directory listings. The standard way for copying a file itself is to open the source and destination, and write to the latter what you read from the former with the usual read and write functions.

    Note also that the source code for GNU and BSD versions of the standard UNIX utilites, such as cp, is freely available. (likewise for rsync) You may want to read some of that source code to see what you may have missed in your own approach.

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