在Bash中检查传递的参数是否为文件或目录

我正在尝试在Ubuntu中编写一个极其简单的脚本，它将允许我传递它一个文件名或目录，并且能够在它是一个文件时做一些特定的事情，当它是一个目录时做一些其他的事情。我遇到的问题是，当目录名，或可能文件，有空格或其他可转义字符在名称中。

下面是我的基本代码，还有几个测试。

#!/bin/bash

PASSED=$1

if [ -d "${PASSED}" ] ; then
    echo "$PASSED is a directory";
else
    if [ -f "${PASSED}" ]; then
        echo "${PASSED} is a file";
    else
        echo "${PASSED} is not valid";
        exit 1
    fi
fi

这是输出:

andy@server~ $ ./scripts/testmove.sh /home/andy/
/home/andy/ is a directory

andy@server~ $ ./scripts/testmove.sh /home/andy/blah.txt
/home/andy/blah.txt is a file

andy@server~ $ ./scripts/testmove.sh /home/andy/blah\ with\ a\ space.txt
/home/andy/blah with a space.txt is not valid

andy@server~ $ ./scripts/testmove.sh /home/andy\ with\ a\ space/
/home/andy with a space/ is not valid

所有这些路径都是有效的，并且存在。

当前回答

使用"file"命令可能会有用:

#!/bin/bash
check_file(){

if [ -z "${1}" ] ;then
 echo "Please input something"
 return;
fi

f="${1}"
result="$(file $f)"
if [[ $result == *"cannot open"* ]] ;then
        echo "NO FILE FOUND ($result) ";
elif [[ $result == *"directory"* ]] ;then
        echo "DIRECTORY FOUND ($result) ";
else
        echo "FILE FOUND ($result) ";
fi

}

check_file "${1}"

输出示例:

$ ./f.bash login
DIRECTORY FOUND (login: directory) 
$ ./f.bash ldasdas
NO FILE FOUND (ldasdas: cannot open `ldasdas' (No such file or  directory)) 
$ ./f.bash evil.php 
FILE FOUND (evil.php: PHP script, ASCII text)

供你参考:上面的答案是有效的，但你可以使用-s来帮助在奇怪的情况下，首先检查一个有效的文件:

#!/bin/bash

check_file(){
    local file="${1}"
    [[ -s "${file}" ]] || { echo "is not valid"; return; } 
    [[ -d "${file}" ]] && { echo "is a directory"; return; }
    [[ -f "${file}" ]] && { echo "is a file"; return; }
}

check_file ${1}

2016-01-25 15:56:41

其他回答

这应该有用。我不知道为什么会失败。你正确地引用了变量。如果使用双[[]]，会发生什么?

if [[ -d $PASSED ]]; then
    echo "$PASSED is a directory"
elif [[ -f $PASSED ]]; then
    echo "$PASSED is a file"
else
    echo "$PASSED is not valid"
    exit 1
fi

双方括号是对[]的bash扩展。它不要求变量被引用，即使它们包含空格。

同样值得尝试:-e测试路径是否存在，而不测试它是什么类型的文件。

2011-01-12 03:27:31

更优雅的解决方案

echo "Enter the file name"
read x
if [ -f $x ]
then
    echo "This is a regular file"
else
    echo "This is a directory"
fi

2018-08-07 04:44:47

#!/bin/bash                                                                                               
echo "Please Enter a file name :"                                                                          
read filename                                                                                             
if test -f $filename                                                                                      
then                                                                                                      
        echo "this is a file"                                                                             
else                                                                                                      
        echo "this is not a file"                                                                         
fi

2017-02-06 11:42:28

在/bin/test上使用-f和-d开关:

F_NAME="${1}"

if test -f "${F_NAME}"
then                                   
   echo "${F_NAME} is a file"
elif test -d "${F_NAME}"
then
   echo "${F_NAME} is a directory"
else                                   
   echo "${F_NAME} is not valid"
fi

2017-08-26 20:44:29

使用"file"命令可能会有用:

#!/bin/bash
check_file(){

if [ -z "${1}" ] ;then
 echo "Please input something"
 return;
fi

f="${1}"
result="$(file $f)"
if [[ $result == *"cannot open"* ]] ;then
        echo "NO FILE FOUND ($result) ";
elif [[ $result == *"directory"* ]] ;then
        echo "DIRECTORY FOUND ($result) ";
else
        echo "FILE FOUND ($result) ";
fi

}

check_file "${1}"

输出示例:

$ ./f.bash login
DIRECTORY FOUND (login: directory) 
$ ./f.bash ldasdas
NO FILE FOUND (ldasdas: cannot open `ldasdas' (No such file or  directory)) 
$ ./f.bash evil.php 
FILE FOUND (evil.php: PHP script, ASCII text)

供你参考:上面的答案是有效的，但你可以使用-s来帮助在奇怪的情况下，首先检查一个有效的文件:

#!/bin/bash

check_file(){
    local file="${1}"
    [[ -s "${file}" ]] || { echo "is not valid"; return; } 
    [[ -d "${file}" ]] && { echo "is a directory"; return; }
    [[ -f "${file}" ]] && { echo "is a file"; return; }
}

check_file ${1}

2016-01-25 15:56:41

在Bash中检查传递的参数是否为文件或目录

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