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How debian readdir integrates with other tools
How debian readdir integrates with other tools
Apr 13, 2025 am 09:42 AM
The readdir function in the Debian system is a system call used to read directory contents and is often used in C programming. This article will explain how to integrate readdir with other tools to enhance its functionality.
Method 1: Combining C language programs and pipelines
First, write a C program to call the readdir function and output the result:
#include<stdio.h>
#include<stdlib.h>
#include<dirent.h>
int main(int argc, char *argv[]) {
DIR *dir;
struct dirent *entry;
if (argc != 2) {
fprintf(stderr, "Usage: %s<directory> \n", argv[0]);
return EXIT_FAILURE;
}
dir = opendir(argv[1]);
if (dir == NULL) {
perror("opendir");
return EXIT_FAILURE;
}
while ((entry = readdir(dir)) != NULL) {
printf("%s\n", entry->d_name);
}
closedir(dir);
return EXIT_SUCCESS;
}</directory></dirent.h></stdlib.h></stdio.h>
Compile the program (assuming the file name is readdir_example.c ): gcc -o readdir_example readdir_example.c
Then, use a pipeline to pass the output to other tools, such as grep :
./readdir_example /path/to/directory | grep "\.txt$"
This will only display files ending in .txt under the /path/to/directory directory.
Method 2: Shell script automation
Create a shell script (for example process_directory.sh ):
#!/bin/bash
if [ $# -ne 1 ]; then
echo "Usage: $0<directory> "
exit 1
fi
for file in $(./readdir_example "$1"); do
echo "Processing: $file"
#Add the actions you want to perform on each file here, for example:
# if [ -f "$file" ]; then # Check if it is a file# echo "$file is a file"
# fi
done</directory>
Grant script execution permissions: chmod x process_directory.sh
Run the script: ./process_directory.sh /path/to/directory
Method 3: Python scripts
Using Python can more conveniently handle the output of readdir :
import os
import sys
def list_directory(path):
for entry in os.listdir(path):
print(entry)
if __name__ == "__main__":
if len(sys.argv) != 2:
print("Usage: python list_directory.py<directory> ")
sys.exit(1)
list_directory(sys.argv[1])</directory>
Run the script: python list_directory.py /path/to/directory
Through the above methods, you can flexibly integrate readdir with other tools or scripts to achieve more powerful directory operation functions. Remember to replace /path/to/directory as your actual directory path.
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