什么命令检查Bash shell脚本中是否存在目录?


当前回答

或者对于完全无用的东西:

[ -d . ] || echo "No"

其他回答

如果要检查目录是否存在,无论它是真实目录还是符号链接,请使用以下命令:

ls $DIR
if [ $? != 0 ]; then
        echo "Directory $DIR already exists!"
        exit 1;
fi
echo "Directory $DIR does not exist..."

解释:如果目录或符号链接不存在,则“ls”命令会给出错误“ls:/x:No such file or directory”,并将返回代码设置为非空(通常为“1”),您可以通过“$?”检索该代码。请确保在调用“ls”后直接检查返回代码。

if [ -d "$DIRECTORY" ]; then
    # Will enter here if $DIRECTORY exists
fi

这不是完全正确的。。。

如果要转到该目录,还需要具有该目录的执行权限。也许你也需要写权限。

因此:

if [ -d "$DIRECTORY" ] && [ -x "$DIRECTORY" ] ; then
    # ... to go to that directory (even if DIRECTORY is a link)
    cd $DIRECTORY
    pwd
fi

if [ -d "$DIRECTORY" ] && [ -w "$DIRECTORY" ] ; then
    # ... to go to that directory and write something there (even if DIRECTORY is a link)
    cd $DIRECTORY
    touch foobar
fi

从脚本文件myScript.sh:

if [ -d /home/ec2-user/apache-tomcat-8.5.5/webapps/Gene\ Directory ]; then
   echo "Directory exists!"
   echo "Great"
fi

Or

if [ -d '/home/ec2-user/apache-tomcat-8.5.5/webapps/Gene Directory' ]; then
   echo "Directory exists!"
   echo "Great"
fi

ls命令与-l(长列表)选项一起返回有关文件和目录的属性信息。特别是ls-l输出的第一个字符通常是d或a-(破折号)。在d的情况下,列出的是一个目录。

仅一行中的以下命令将告诉您给定的ISDIR变量是否包含指向目录的路径:

[[ $(ls -ld "$ISDIR" | cut -c1) == 'd' ]] &&
    echo "YES, $ISDIR is a directory." || 
    echo "Sorry, $ISDIR is not a directory"

实际用途:

    [claudio@nowhere ~]$ ISDIR="$HOME/Music" 
    [claudio@nowhere ~]$ ls -ld "$ISDIR"
    drwxr-xr-x. 2 claudio claudio 4096 Aug 23 00:02 /home/claudio/Music
    [claudio@nowhere ~]$ [[ $(ls -ld "$ISDIR" | cut -c1) == 'd' ]] && 
        echo "YES, $ISDIR is a directory." ||
        echo "Sorry, $ISDIR is not a directory"
    YES, /home/claudio/Music is a directory.

    [claudio@nowhere ~]$ touch "empty file.txt"
    [claudio@nowhere ~]$ ISDIR="$HOME/empty file.txt" 
    [claudio@nowhere ~]$ [[ $(ls -ld "$ISDIR" | cut -c1) == 'd' ]] && 
        echo "YES, $ISDIR is a directory." || 
        echo "Sorry, $ISDIR is not a directoy"
    Sorry, /home/claudio/empty file.txt is not a directory

或者对于完全无用的东西:

[ -d . ] || echo "No"