File Handling (Linux)

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Introduction to Linux in HPC/Files
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Tutorial
Title: Introduction to Linux in HPC
Provider: HPC.NRW

Contact: tutorials@hpc.nrw
Type: Multi-part video
Topic Area: HPC Platforms
License: CC-BY-SA
Syllabus

1. Background and History
2. The Command Line
3. Linux Directory Structure
4. Files
5. Text display and search
6. Users and permissions
7. Processes
8. The vim text editor
9. Shell scripting
10. Environment variables
11. System configuration
12. SSH Connections
13. SSH: Graphics and File Transfer
14. Various tips

This part of the tutorial will introduce how Linux deals with files and explain how to list, copy, move and find files in the directory structure.

Video

( Slides as pdf)


Info:  ll is an alias for ls -laF, often available by default on many Linux distributions. It provides additional information such as file sizes, modification dates and full paths in the case of links.


Info:  ls -d * can be used to list only directory names instead of their contents when using the * pattern (or other wildcards).

Quiz


1. Can you copy directory with cp <old_dir> <new_dir>?

Yes.
No, the -r argument is needed to copy a directory.


Warning:  rm -f: no confirmation! Use with care.

2. What would be a suitable wildcard for listing the files test_01, test_02, test_03 and prod_02 but NOT test_04 and debug_02

*_*
[t,p]*_*
[t,p]???_0[1-3]
*_0[1-3]


Warning:  The shell expands wildcards before they are passed as arguments! In some cases (for example, when using find with a wildcard), you should enclose the wildcard in quotes: find . -type f -name "*test*".

Exercises in Terminal

1. Use the find command to search for files, whose name ends with dat, in your home directory.
2. Use the find command to search for directories, whose name begins with test and ends with _dir, in your home directory.


<< Linux Directory Structure

Overview

Text Display and Search >>