linux - 字符串操作 - 替换某些字符

Question

我有一个 linux 命令输出如下所示的文件列表:

    folder/folder/folder/file_1
    folder_1/folder/folder/file2

我想格式化此输出以满足以下条件:

• 最后一个斜杠 (/) 始终替换为三个下划线
• 除最后一个斜杠外的所有斜杠都替换为一个下划线
• 文件夹名称中的任何下划线都替换为两个下划线
• 文件名中的任何下划线保持原样

上面看起来像:

    folder_folder_folder___file_1
    folder__1_folder_folder___file2

如果您也可以解释您的解决方案，那将会很有帮助。谢谢!

Answer 1

# Assume each line in a variable called $value
# Split the values up into dirname and basename
val_dir="${value%/*}"
val_base="${value##*/}"

# Replace underscores in dirname with two underscores
val_dir="${val_dir//_/__}"
# Replace slashes in dirname with single underscore
val_dir="${val_dir//\//_}"

# Re-join dirname and basename with three underscores
result="${val_dir}___${val_base}"