if文で-eの意味は何ですか？

Question

私はいくつかのPerlコードに次のが見つかりました：

if (! -e $options{"inPath"}){ 
     $logger->fatal("Directory \'$options{\"inPath\"}\' does not exist.\n"); 
} 

if文の-eは何をしますか？

Answer 1

online perlドキュメントサイトの​​を参照してください。 -e '/foo'は、ファイル/fooが存在する場合にtrueを返します。

システムにperldocがインストールされている場合は、コマンドラインからもアクセスできます。

perldoc -f -X 

Answer 2

perldocunaryオペレータ-eチェックファイルが存在する場合。

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はperldoc単項ファイルテスト演算子のリスト：

-r File is readable by effective uid/gid. 
    -w File is writable by effective uid/gid. 
    -x File is executable by effective uid/gid. 
    -o File is owned by effective uid. 
    -R File is readable by real uid/gid. 
    -W File is writable by real uid/gid. 
    -X File is executable by real uid/gid. 
    -O File is owned by real uid. 
    -e File exists. 
    -z File has zero size (is empty). 
    -s File has nonzero size (returns size in bytes). 
    -f File is a plain file. 
    -d File is a directory. 
    -l File is a symbolic link (false if symlinks aren't 
     supported by the file system). 
    -p File is a named pipe (FIFO), or Filehandle is a pipe. 
    -S File is a socket. 
    -b File is a block special file. 
    -c File is a character special file. 
    -t Filehandle is opened to a tty. 
    -u File has setuid bit set. 
    -g File has setgid bit set. 
    -k File has sticky bit set. 
    -T File is an ASCII or UTF-8 text file (heuristic guess). 
    -B File is a "binary" file (opposite of -T). 
    -M Script start time minus file modification time, in days. 
    -A Same for access time. 
    -C Same for inode change time (Unix, may differ for other 
    platforms)