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Updated on 2025-03-04

Sharing of skills to generate MD5 checksum of jar file in Linux

introduction

What is an MD5 checksum? MD5 (Message-Digest Algorithm 5) is a widely used hash function that generates fixed-length digest values ​​for files. MD5 checksums can be used to verify file integrity. If the file is modified during transfer or storage, its MD5 checksum will change.

Why generate an MD5 checksum on a JAR file? JAR files (Java Archive) are a common Java project packaging format. Generating an MD5 checksum on a JAR file ensures that it has not been tampered with, especially when multiple developers collaborate or are distributed online.

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1. Check the system environment

Before starting, please make sure your system is installed.md5sumtool. Linux systems usually include this tool by default.

md5sum --version

If the version information appears, it means that it has been installed. If not installed, you can install it through the following command:

# For Debian/Ubuntu systemssudo apt update && sudo apt install coreutils

# For CentOS/RHEL systemssudo yum install coreutils

2. Prepare the JAR file

Suppose you have a name calledThe JAR file, the path is/home/user/projects/. If not, you can create a simple JAR file with the following command:

# Create a test JAR fileecho "Hello World" > 
jar cf

3. Use md5sum to generate MD5 checksum

Run the following command to generate an MD5 checksum:

md5sum /home/user/projects/

The output result is similar to:

d41d8cd98f00b204e9800998ecf8427e  /home/user/projects/

Analysis results:

  • d41d8cd98f00b204e9800998ecf8427eis the MD5 checksum of the JAR file.
  • /home/user/projects/is the corresponding file path.

4. Verify file integrity

Save the generated MD5 checksum to a file:

md5sum /home/user/projects/ > checksum.md5

When you need to verify the file, use the following command:

md5sum -c checksum.md5

If the file is not modified, the output will be:

: OK

5. Bulk MD5 checksum

If you need to generate MD5 checksums on multiple JAR files, you can use the following script:

#!/bin/bash
# Bulk generation of MD5 checksums for JAR filesfor file in /home/user/projects/*.jar
do
    md5sum "$file" >> all_checksums.md5
done

Save asgenerate_checksums.sh, and grant execution permissions:

chmod +x generate_checksums.sh
./generate_checksums.sh

Summarize

Through this article, you have learned:

  1. Check and installmd5sumtool.
  2. usemd5sumGenerate MD5 checksums for single and multiple JAR files.
  3. Verify file integrity to ensure that the file has not been modified.

MD5 checksum is the basic tool for file integrity verification. Although its security is not as safe as modern hash algorithms (such as SHA-256), it is still a fast and efficient choice in most non-security scenarios.

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