3. cp and mv Command in Centos.md

Linux Commands: cp and mv 🚀

1. cp Command (Copy Command) 📂

The cp command is used to copy one or more files from one location to another. It allows copying files from a single or multiple sources to a single destination.

Basic cp Command Example ✨

You can copy a file to another file using the cp command.
Example:

$ cp Nikhilpatidar1 nikhilpatidar2

📌 This command will copy the file Nikhilpatidar1 and save it as nikhilpatidar2.

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cp -v Command (Verbose) 🔍

Using the -v (verbose) option, you can get detailed output of files being copied.
Example:

$ cp -v nikhil Patidar indore d1/

📌 This command copies the files nikhil, Patidar, and indore into the d1 directory while displaying details of the operation.

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Copying Multiple Files to a Single Destination 📁

You can copy multiple source files to a single destination using the cp command.
Example:

$ cp -v /etc/password /etc/group /etc/gsadow root/desktop/d1/

📌 This command copies /etc/password, /etc/group, and /etc/gsadow files to the root/desktop/d1/ directory.

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Copying All Files from a Directory 📂

The command cp -v /var/log/* root/desktop tries to copy all files from a directory but does not copy subdirectories.
Example:

$ cp -v /var/log/* root/desktop

📌 This command copies all files from the /var/log/ directory to root/desktop, but not the directories inside.

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Copying with Recursive Option (-r) 🔄

If you need to copy a directory along with its subdirectories, use the -r (recursive) option.

Example:

$ cp -vr /var/log/* .

📌 This command copies all files and directories from /var/log/ to the current directory (.).
📢 The -v (verbose) option provides details of each copied file and directory.

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Copying Files to a Specific Directory 📤

The . symbol represents the current directory. If used as the destination, files will be copied to the current directory.

Example:

$ cp -vr /var/log/* ./desktop/d4/

📌 This command copies all files and directories from /var/log/ to ./desktop/d4/.

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Copying to the Root Directory 🏠

If you want to copy files to the root directory (/), root permissions are required.

Example:

$ cp -vr /var/log/ /

📌 This command copies all files and directories from /var/log/ to the root directory.

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Copying to the Parent Directory Using .. 🔙

The .. symbol represents the parent directory. It is used to copy files one level up.

Example:

$ cp -vr /etc/passed ../tmp/

📌 This command copies /etc/passed to the parent directory (../tmp/).

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2. mv Command (Move Command) 🚚

The mv command is used in Linux and Unix-based systems to move (relocate) files or directories or rename them.

Syntax:

mv [options] source destination

1. source: The file or directory to be moved or renamed.
2. destination: The location where the file or directory should be moved, or the new name for renaming.

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Basic Usage: 📝

1. Move a file to a directory:

   Example:

   mv file.txt /home/user/Documents/

   📌 Moves file.txt to the /home/user/Documents/ directory.

2. Rename a file:

   Example:

   mv old_name.txt new_name.txt

   📌 Renames old_name.txt to new_name.txt.

3. Move and rename a file:

   Example:

   mv file.txt /home/user/Documents/new_file.txt

   📌 Moves file.txt to /home/user/Documents/ and renames it to new_file.txt.

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Additional Options: ⚙️

1. -i (Interactive Mode) 🛑: Prompts before overwriting a file.

   Example:

   mv -i old_file.txt /home/user/Documents/

   📌 If old_file.txt already exists in the destination, confirmation is required before overwriting.

2. -f (Force Mode) ⚡: Overwrites files without prompting.

   Example:

   mv -f old_file.txt /home/user/Documents/

   📌 If old_file.txt exists at the destination, it is overwritten without confirmation.

3. -u (Update Mode) 🔄: Moves the file only if the source is newer or the destination file does not exist.

   Example:

   mv -u file.txt /home/user/Documents/

   📌 The file is moved only if the source is newer than the existing destination file or if the destination file does not exist.

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The rename command in Linux is used to rename multiple files at once using a pattern. Unlike mv, which renames a single file at a time, rename is useful for batch renaming.

📌 Syntax:

rename [options] 's/old_pattern/new_pattern/' files

• 🔍 s/old_pattern/new_pattern/ → This is a Perl-style substitution expression.
• 📂 files → The list of files to rename.

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📌 Examples:

1️⃣ Rename .txt files to .bak

rename 's/.txt$/.bak/' *.txt

✅ Changes:
📄 file1.txt → 📝 file1.bak
📄 notes.txt → 📝 notes.bak

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2️⃣ Convert all filenames from UPPERCASE to lowercase

rename 'y/A-Z/a-z/' *

✅ Changes:
📄 File.TXT → file.txt
📄 Document.DOC → document.doc

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3️⃣ Add a prefix to all .jpg files

rename 's/^/old_/' *.jpg

✅ Changes:
🖼️ photo.jpg → old_photo.jpg
🖼️ image.jpg → old_image.jpg

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4️⃣ Replace spaces with underscores in filenames

rename 's/ /_/g' *

✅ Changes:
📂 my file.txt → my_file.txt
📂 new document.doc → new_document.doc

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🛠 Alternative: mmv Command

If rename is not installed, you can use mmv:

mmv "*.txt" "#1_backup.txt"

✅ Changes:
📄 file1.txt → file1_backup.txt
📄 notes.txt → notes_backup.txt

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📥 Installing rename

If rename is not available, install it:

• 🐧 Debian/Ubuntu:

  sudo apt install rename

• 🎩 CentOS/RHEL:

  sudo yum install prename

• 🏹 Arch Linux:

  sudo pacman -S perl-rename