tcsh 检查给定路径中是否存在文件

Question

首先，我是 tcsh 的新手，我意识到它的缺点以及它为什么有害（我同意！）。

但是，我别无选择，我需要编写一个 tcsh 脚本，用户提供一个目录作为输入，脚本将检查其中是否包含文件 'test.txt'。

子目录在技术上也将被标记为拥有它。

我假设这需要递归并且我知道检查文件是否存在并且是我可以使用的常规文件

if ( ! -d ) then
    echo  "is not a directory."
    exit 1
endif

if ( -f test.txt ) then    #BUT LINK IT TO , as if test.txt exists in 
                           #given user path or its parent directories

     echo "The path includes the file."
else
     echo "The path does NOT include the file."
endif

我希望它能够检查 $1（这将是用户输入）。

Answer 1

您可以使用一个简单的 while 循环：

# Expand parameter to full path
set dir = `readlink -f ""`

# Not a directory? Stop now
if ( ! -d "$dir" ) then
    echo "$dir is not a directory."
    exit 1
endif

# Loop forever
while (1)
    # Check if $dir has test.txt, if it does, stop the loop
    if ( -f "$dir/test.txt" ) then
        echo "The path $dir includes the file."
        break
    else
        echo "The path $dir does NOT include the file."
        # Dir is /, we've checked all the dirs, stop loop and exit
        if ( "$dir" == "/" ) then
            echo "file not found, stopping"
            exit 2
            break
        endif

        # Remove last part of $dir, we use this value in the next loop iteration
        set dir = `dirname "$dir"`
    endif
end

echo "File found at $dir/test.txt"

逻辑应该很明显：在循环的每次迭代中更改 $dir 的值，如果我们找到文件，我们可以停止循环，如果我们已经循环到/ 目录，文件不存在，我们停止。您当然可以将 / 更改为 cwd 或其他内容...

示例输出：

[~]% csh checkdir.csh test/asd/asd/asd/asd/
The path /home/martin/test/asd/asd/asd/asd does NOT include the file.
The path /home/martin/test/asd/asd/asd does NOT include the file.
The path /home/martin/test/asd/asd does NOT include the file.
The path /home/martin/test/asd does NOT include the file.
The path /home/martin/test does NOT include the file.
The path /home/martin does NOT include the file.
The path /home does NOT include the file.
The path / does NOT include the file.
file not found, stopping
Exit 2

[~]% touch test/asd/asd/asd/test.txt
[~]% csh checkdir.csh test/asd/asd/asd/asd
The path /home/martin/test/asd/asd/asd/asd does NOT include the file.
The path /home/martin/test/asd/asd/asd includes the file.
File found at /home/martin/test/asd/asd/asd/test.txt

[~]% rm test/asd/asd/asd/test.txt
The path /home/martin/test/asd/asd/asd/asd does NOT include the file.
The path /home/martin/test/asd/asd/asd does NOT include the file.
The path /home/martin/test/asd/asd does NOT include the file.
The path /home/martin/test/asd does NOT include the file.
The path /home/martin/test does NOT include the file.
The path /home/martin includes the file.
File found at /home/martin/test.txt

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