Скачать или смотреть Resolving tar and split Challenges in Remote File Management

Learn how to effectively use `tar` and `split` commands to manage remote files with `sshpass`, eliminate unwanted messages, and streamline your workflow.
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This video is based on the question https://stackoverflow.com/q/64176227/ asked by the user 'Hani Umer' ( https://stackoverflow.com/u/11580232/ ) and on the answer https://stackoverflow.com/a/64177700/ provided by the user 'Ardit' ( https://stackoverflow.com/u/3297135/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Tackling Remote File Management with tar and split

Managing files on a remote server can often be a challenging task, especially when it comes to archiving and splitting large files efficiently. If you’ve encountered issues with messages interrupting your operations, such as "tar: Removing leading /' from member names," you're not alone. This guide will dive into two crucial questions regarding the use of tarandsplit` commands over SSH, ensuring you have a clearer understanding and a streamlined process.

Understanding the Commands

Before we dive into the specific questions, let’s break down the core commands you are dealing with:

tar: This command is used to create an archive from multiple files. The command options you've used, including -czf, are responsible for creating a compressed tarball.

split: This command is used to split files into smaller chunks, useful for transferring large files in manageable sizes.

Dissecting the Example Command

Your initial command looks as follows:

[[See Video to Reveal this Text or Code Snippet]]

What This Command Does:

Remote Execution: The sshpass command facilitates password-based SSH login into the remote server where tar runs.

Creation of tar Archive: The tar command creates a compressed archive and sends it to stdout.

Local Splitting: The output of tar is piped to split, which generates smaller files locally.

Solution to Your Questions

Now, let's address your specific questions.

Question 1: Understanding File Split Behavior

You were curious why the split files are saved locally. This happens because the split command is executed on your local environment where the output of the tar command is sent over a pipe (|).

To achieve the desired remote operation, where both tar and split occur on the remote server, you can combine the commands with quotes:

[[See Video to Reveal this Text or Code Snippet]]

This modification ensures both processes execute on the remote server while preserving the output in the specified format.

Question 2: Suppressing Output Messages

The unwelcome message "tar: Removing leading /' from member names" occurs because taroutputs warning messages toSTDERR`, which by default is displayed on your terminal.

To suppress these messages without affecting the operation, you can redirect STDERR to /dev/null:

[[See Video to Reveal this Text or Code Snippet]]

This command effectively silences all error/warning messages that normally clutter your output.

Summary

In conclusion, understanding how to manage remote files using tar and split can significantly enhance your workflow. The key points to remember are:

Use quotes to wrap combined commands for remote execution.

Redirect STDERR to suppress unnecessary messages during the process.

By applying these techniques, you can streamline your approach to remote file management, making your scripts cleaner and more efficient. Happy scripting!