-d会返回false。同时，mkdir也会失败（同名文件已存在）。===========你可以自己ls一下啊.....
在使用mkdir之前已经使用过'-d'检查要新建目录是否存在,执行后, 仍然提示 File exists.work 目录新建成功了的. 是权限方面的问题还是, -d 检查有问题? my $directory = "work/month" if ( ! -d $directory) { if ( ! mkdir($directory, 0777)) { print $!; }perlmkdir 有用关注2收藏 回复 阅读4.7...
;}有没有这个可能,两个perlscript进程都在调用这个function,Proc1:check-dok;--->mkdirok;Proc2:--...
Example 1: Check Whether the File Exists or Not Create a Perl file with the following script that takes the filename from the user until a non-existing filename is taken. After taking the valid filename, a line of text will be written in the file. An infinite “while” loop is used ...
Usage: perl perlpp.pl [options] [filename] Options: -o, --output filename Output to the file instead of STDOUT. -D, --define name=value Set $D{name}=value in the generated code. The hash %D always exists, but is empty if you haven't specified any -D options. Also substitutes ...
问R错误:无法读取R中的xls电子表格，给出“file.exists(tfn)中的错误:无效的‘文件’参数”ENpl/sql...
exists()) { println "文件存在" } else { println "文件不存在" } 在上述示例中,我们使用了反斜杠来表示Windows系统上的文件路径。如果要在Unix系统上运行相同的代码,只需将路径中的反斜杠替换为斜杠即可。 File类的应用场景非常广泛,可以用于文件的读取、写入、复制、移动、删除等操作。在云计算领域中,File类...
file命令用来识别文件类型,也可用来辨别一些文件的编码格式。它是通过查看文件的头部信息来获取文件类型,而不是像Windows通过扩展名来确定文件类型的。 1.命令格式: file [ -bchikLnNprsvz ] [ -f namefile ] [ -F separator ] [ -m magicfiles ] file ... ...
Using the TF_SYSTEMLIBS version of protobuf (i.e. a preinstalled protobuf) when building TensorFlow from source results in [libprotobuf ERROR /build/protobuf/3.19.4/GCCcore-11.3.0/protobuf-3.19.4/src/google/protobuf/descriptor_database.cc:641] File already exists in database: tensorflow/...
so you can continue to recursively parse the filesystem. The quickest way to tell files from directories is to use Perl's built-in File Test Operators. Perl has operators you can use to test different aspects of a file. The -f operator is used to identify regular files rather than ...