-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.....
Check if File Exists top FileExistsAsync (1) # returns a CkTask # $remotePath is a string # $followLinks is a boolean $ret_task = $sFtp->FileExistsAsync($remotePath, $followLinks);Introduced in version 9.5.0.67Creates an asynchronous task to call the FileExists method with the arguments...
主要有keys()、values()、exists()和delete()。 keys()返回hash结构中所有key组成的列表。例如keys %hash values()则返回hash结构中所有value组成的列表。例如values %hash exists()用来检测hash结构中元素是否存在。例如exists $hash{KEY} delete()用来删除hash中的一个元素。例如delete $hash{KEY} 下面是keys和...
an error will occur. If the file exists and the user opens the file for writing, the existing content of the file will be overwritten. So, it is necessary to check whether the file exists or not before reading or writing.
if(!open(MYFILE,"myfile")) {die("cannot open input file file1\n"); }open(MYFILE,"file1") ||die("Could not open file");close(MYFILE); 例子.读文件并显示 #!/usr/bin/perl&gotest("/home/macg/perltest/gogo");&gotest("/home/macg/www/index.html");&gotest("jk");subgotest...
if(exists $ha{$soft}){ if(-e $ha{$soft}){ return $ha{$soft}; }else{ die "\nConfig Error: $soft wrong path in $config\n"; } }else{ die "\nConfig Error: $soft not set in $config\n"; } } 1; __END__ 1. 2.
if ( exists $hash{'aa'} ) { print "aa exists/n"; } else { print "aa not exists/n"; } 结果: [root@localhostr ~]# perl -w 1.pl b ok c ok aa exists # a 没有赋值过值,所以是undef ,b赋值为空,空也是赋值,c赋值,哈希存在aa值 ...
问如何在不使用-e和-d的情况下在Perl中查找与提示输入匹配的文件...File::Find only way？EN既然是...
";open(my$outfile,'>:encoding(UTF-8)','out.txt')ordie"Couldn\'t open file out.txt $!";my$lnum=0;while(my$row=<$infile>){chomp$row;if($row=~/ {8}".*"/){$row=~/ +"(.*)"/;if(exists$hash{$1}){$hash{$1}++;$row=~s/(?<= {8}")(.*)(?=")/$1$hash{$1}/...
使用exists 函数检查键是否存在于哈希中。 if (exists $prices{"apple"}) { print "Apple price: $prices{'apple'}\n"; } else { print "Apple not found in prices hash.\n"; } 5.5. 获取所有键和值 keys 函数返回哈希的所有键。 values 函数返回哈希的所有值。 my @all_keys = keys %prices; ...