☰

具有进程替换的命名文件描述符

tag-icon • tag-icon bash file-descriptors process-substitution
具有进程替换的命名文件描述符

我正在尝试将命名文件描述符与进程替换一起使用。
我写了下面的代码，但它不起作用：

# Open named file descriptors and associate to Process Substitution result
exec {folder1_files_list} < <( ls -v "${FOLDER1_PATH}"/* )
exec {folder2_files_list} < <( ls -v "${FOLDER2_PATH}"/* )

IFS=$'\n' read -r folder1_filename -u "${folder1_files_list}"
IFS=$'\n' read -r folder2_filename -u "${folder2_files_list}"

# Close named file descriptors
exec {folder1_files_list}<-
exec {folder2_files_list}<-

错误是：

exec: {folder1_files_list}: not found

我已经通读了 bash 手册，但可能遗漏了一些东西

答案1

这是为我们的下一代提供的完整有效代码：

exec {folder1_files_list}< <( ls -v -1 "${FOLDER1}"/* )
# Usage example:
# If I want to output the entire contents of the file descriptor, 
# then I should write:
#   cat - <&$folder1_files_list

exec {folder2_files_list}< <( ls -v -1 "${FOLDER2}"/* )

IFS=$'\n' read -r -u $folder1_files_list folder1_filename
IFS=$'\n' read -r -u $folder2_files_list folder2_filename

exec {folder1_files_list}<&-
exec {folder2_files_list}<&-

相关内容