如何在Bash脚本中访问目标目录并压缩其中文件？

Hey there! Nice job getting the current directory compression working—you’re already halfway there! Let’s break down how to adapt your script to handle a specified target directory, with practical examples and beginner-friendly tips to make it robust.

Basic Target Directory Compression #

If you’re using tar (the go-to tool for this on Unix-like systems), here’s a simple script that takes a target directory path as input and compresses it properly:

#!/bin/bash

# Prompt for the target directory path
read -p "Enter the target directory path to compress: " target_dir

# First, check if the directory actually exists—avoids messy errors!
if [ -d "$target_dir" ]; then
    # Create a timestamped archive (so you don't overwrite old files)
    archive_name="${target_dir##*/}_$(date +%Y%m%d_%H%M%S).tar.gz"
    tar -czf "$archive_name" "$target_dir"
    echo "Success! Compressed $target_dir into $archive_name"
else
    echo "Oops: Directory $target_dir doesn't exist. Double-check the path!"
    exit 1
fi

Let’s break down the key parts: #

• [ -d "$target_dir" ]: This checks if the path you entered is a valid directory—critical for preventing the script from failing silently if you mistype a path.
• tar -czf <output-file> <directory>:
  • -c: Creates a new archive
  • -z: Uses gzip compression (swap with -j if you prefer .bz2 format)
  • -f: Specifies the output file name
• ${target_dir##*/}: Extracts just the directory name from the full path (e.g., turns /home/user/photos into photos)
• $(date +%Y%m%d_%H%M%S): Adds a timestamp to the archive name so you never overwrite older backups.

Alternative: Accept Target Directory as a Command-Line Argument #

If you want to run the script directly with a path (like ./compress.sh /path/to/my/folder), use this version instead:

#!/bin/bash

# Check if the user provided a directory argument
if [ $# -ne 1 ]; then
    echo "Usage: $0 <target-directory-path>"
    exit 1
fi

target_dir="$1"

if [ -d "$target_dir" ]; then
    archive_name="${target_dir##*/}_$(date +%Y%m%d_%H%M%S).tar.gz"
    tar -czf "$archive_name" "$target_dir"
    echo "Successfully compressed $target_dir!"
else
    echo "Error: $target_dir is not a valid directory."
    exit 1
fi

Bonus: Combine Current + Target Directory Compression #

Since you already have the current directory part working, you can merge both into one script:

#!/bin/bash

# Compress current directory first
current_archive="current_dir_$(date +%Y%m%d_%H%M%S).tar.gz"
tar -czf "$current_archive" .
echo "Compressed current directory into $current_archive"

# Now handle the target directory
read -p "Enter target directory to compress: " target_dir
if [ -d "$target_dir" ]; then
    target_archive="${target_dir##*/}_$(date +%Y%m%d_%H%M%S).tar.gz"
    tar -czf "$target_archive" "$target_dir"
    echo "Compressed $target_dir into $target_archive"
else
    echo "Skipping target directory compression: $target_dir doesn't exist."
fi

Quick Beginner Tips: #

• Always quote variables like "$target_dir"—this handles paths with spaces in them (super important if your directory names have spaces!)
• Test the tar command manually in your terminal first before adding it to a script (e.g., tar -czf test.tar.gz /path/to/dir)
• To exclude specific files/directories, add --exclude='pattern' to the tar command (e.g., tar -czf archive.tar.gz --exclude='*.log' /path/to/dir)

内容的提问来源于stack exchange，提问作者Usman Malik