如何用Shell脚本批量替换文本文件中大小写不敏感的指定字符串

No worries, I’ll walk you through a simple shell script that does exactly what you need—no prior shell experience required!

Here’s the script you can use:

#!/bin/bash

# Loop through every .txt file in the current directory
for txt_file in *.txt; do
    # Skip if there are no .txt files (avoids errors)
    [ -f "$txt_file" ] || continue

    # Perform case-insensitive replacements:
    # - Replace any case of "october" with "oct"
    # - Replace any case of "november" with "nov"
    # - Replace any case of "monday" with "mon"
    # The \b ensures we only match whole words (not parts of longer words)
    sed -i'' -e 's/\boctober\b/oct/Ig' \
        -e 's/\bnovember\b/nov/Ig' \
        -e 's/\bmonday\b/mon/Ig' \
        "$txt_file"

    echo "Successfully updated: $txt_file"
done

How to use this script: #

1. Open a text editor (like Notepad on Windows, TextEdit on macOS, or Gedit on Linux)
2. Copy and paste the entire script above into the editor
3. Save the file with a name like replace_abbrevs.sh (make sure the extension is .sh)
4. Open your terminal/command prompt and navigate to the folder where you saved the script and your .txt files
5. Make the script executable by running:

   chmod +x replace_abbrevs.sh
   

6. Run the script:

   ./replace_abbrevs.sh
   

Important Notes: #

• Case Insensitivity: The I flag in sed makes the search match any case (e.g., OCTOBER, October, october all get replaced with oct).
• Whole Words Only: The \b around each word ensures we don’t accidentally replace parts of longer words (like if a file had "octoberfest", it won’t turn into "octfest").
• Cross-Platform Tip: If you’re using macOS, the sed command needs a small tweak—change sed -i'' to sed -i '' (add a space between -i and the empty string). Alternatively, if you want to keep backup copies of your original files, use sed -i.bak instead (this will create files like file.txt.bak with the original content).
• No .txt Files?: If there are no .txt files in the folder, the script will just skip doing anything—no errors to worry about!

内容的提问来源于stack exchange，提问作者user3668036