这是一个非常基本的问题,但我是perl的新手,无法解决问题所在。我只是想隔离目录中的文件,但是-d运算符会将所有文件夹内容视为文件......
@contents是我的数组,当我运行它时:
use strict;
if ($ARGV[1]) {
die("Error: You can only monitor one directory at a time\n");
}
my $directory = $ARGV[0] || die "Error: No directory defined\n";
opendir(DIR, $directory) || die "Error: Can't open dir $directory: $!";
my @contents = readdir(DIR);
foreach my $item(@contents) {
if (-d $item) { next; }
print"$item is a file\n";
}
closedir (DIR);
我不断收到文件夹和文件。或者,如果我使用-f,我什么也得不到。
编辑:这是输出 -
file01.txt is a file
folder 01 is a file
folder 02 is a file
Screen shot 2010-04-18 at 1.26.17 PM.png is a file
我在OSX上运行它
编辑:dir ls -l
输出:
aaron ~/Documents/test: ls -l
total 112
-rw-r--r--@ 1 aaron staff 51235 18 Apr 13:26 Screen shot 2010-04-18 at 1.26.17 PM.png
-rw-r--r--@ 1 aaron staff 7 18 Apr 13:26 file01.txt
drwxr-xr-x 3 aaron staff 102 18 Apr 13:25 folder 01
drwxr-xr-x 2 aaron staff 68 18 Apr 13:25 folder 02
答案 0 :(得分:5)
我正在测试'。'作为目录...你正在测试一些其他目录。然后,相对于当前目录检查从目录中读取的名称。如果我使用其他一些目录名,我几乎可以获得除“。”之外的所有内容。和'..'列为文件,无论如何。
如果您在名称前加上$ ARGV [0]的值,您将获得预期的结果:
#!/bin/perl -w
use strict;
if ($ARGV[1]) {
die("Error: You can only monitor one directory at a time\n");
}
my $directory = $ARGV[0] || die "Error: No directory defined\n";
opendir(DIR, $directory) || die "Error: Can't open dir $directory: $!";
my @contents = readdir(DIR);
foreach my $item(@contents) {
next if -d "$ARGV[0]/$item";
print "$ARGV[0]/$item is a file\n";
}
closedir (DIR);
这适用于MacOS X:
#!/bin/perl -w
use strict;
my @contents = <*>;
foreach my $item (@contents)
{
print "== $item\n";
next if -d $item;
print "$item is a file\n";
}
测试:
MiniMac JL: perl -c xx.pl
xx.pl syntax OK
MiniMac JL: perl xx.pl
== cproto-4.7g
== fpqsort1
fpqsort1 is a file
== fpqsort1.h
fpqsort1.h is a file
== fpqsort2
fpqsort2 is a file
== fpqsort2.c
fpqsort2.c is a file
== gcc-predef.h
gcc-predef.h is a file
== git-1.6.5.7
== go
== makefile
makefile is a file
== qs-test1.c
qs-test1.c is a file
== qs-test2.c
qs-test2.c is a file
== RCS
== rep-report.txt
rep-report.txt is a file
== select.c
select.c is a file
== soq
== xx.pl
xx.pl is a file
MiniMac JL:
考虑到问题中代码的略微修改版本:
#!/bin/perl -w
use strict;
if ($ARGV[1]) {
die("Error: You can only monitor one directory at a time\n");
}
my $directory = $ARGV[0] || die "Error: No directory defined\n";
opendir(DIR, $directory) || die "Error: Can't open dir $directory: $!";
my @contents = readdir(DIR);
foreach my $item(@contents) {
print "<<$item>>\n";
next if -d $item;
print"$item is a file\n";
}
closedir (DIR);
在与以前相同的目录上运行它,我得到输出:
Minimac JL: perl yy.pl .
<<.>>
<<..>>
<<cproto-4.7g>>
<<fpqsort1>>
fpqsort1 is a file
<<fpqsort1.h>>
fpqsort1.h is a file
<<fpqsort2>>
fpqsort2 is a file
<<fpqsort2.c>>
fpqsort2.c is a file
<<gcc-predef.h>>
gcc-predef.h is a file
<<git-1.6.5.7>>
<<go>>
<<makefile>>
makefile is a file
<<qs-test1.c>>
qs-test1.c is a file
<<qs-test2.c>>
qs-test2.c is a file
<<RCS>>
<<rep-report.txt>>
rep-report.txt is a file
<<select.c>>
select.c is a file
<<soq>>
<<xx.pl>>
xx.pl is a file
<<yy.pl>>
yy.pl is a file
Minimac JL:
请注意Perlish习语'next if -d $item;
'。还要注意调试技巧:在通过数组时打印名称 - 使用'&lt;&lt;'和'&gt;&gt;'包围名称有助于识别奇怪的副作用(例如名称中的换行符)。我仔细检查了提供的代码产生的结果是否相同 - 它确实如此。我正在运行带有Perl库存的MacOS X 10.6.3。
答案 1 :(得分:3)
来自readdir上的Perldoc:
如果您打算对其进行测试 从readdir返回值,你会 更好地预先添加目录 题。否则,因为我们没有 那里的chdir,本来就是 测试错误的文件。
调试代码:
#!/usr/bin/perl
use strict;
if ($ARGV[1]) {
die("Error: You can only monitor one directory at a time\n");
}
my $directory = $ARGV[0] || die "Error: No directory defined\n";
opendir(DIR, $directory) || die "Error: Can't open dir $directory: $!";
my @contents = readdir(DIR);
foreach my $item (@contents) {
print "\$item=$item\n";
print "$item is a file \n" if (-f $directory."/".$item);
print"$item is a dir\n" if (-d $directory."/".$item);
}
closedir (DIR);
答案 2 :(得分:2)
我猜你的@contents
在文件末尾有换行符。尝试添加chomp
:
foreach $item(@contents) {
chomp($item);
next if (-d $item);
print"$item is a file\n";
}