This document discusses various Perl functions and operations for working with files and directories. It covers opening and closing filehandles, reading and writing files, special file variables, directory operations like opendir and readdir, file tests (-f, -d etc.), renaming and moving files with rename, copying files with File::Copy, deleting files with unlink, changing directories with chdir, and executing external programs from Perl.

1. Fitxers I Directoris

2. Poesia del Perl

3. open my $me,'<',$0
or die $!
while (<$me>) {
chomp;
say if length;
}
my $beyond = <$me>
and print
"there is $beyond me !";
close $me;

4. Variables Explícites
open my $me,'<',$0
or die $!
while (my $line=<$me>) {
chomp $line;
say $line if length;
}
my $beyond = <$me>
and print
"there is $beyond me !";
close $me;

5. FileHandler
● <$filehandler>

6. Open
open my $filehandler,”MODE”,$filename
or die $!;

7. Modes
<
>
>>
+<

8. Modes
< : open my $fhr,'<',”filename”
>
>>
+<

9. Modes
<
> : open my $fhw,'>',”filename”
>>
+<

10. More info
● perldoc perlopentut
● perldoc perlfaq5

11. closing
close $fh
or die $!;

12. Reading
● Readline: <>

13. Reading
● Readline: <>
while (my $line=<$fh>) {
chomp $line;
say "Read a line '$line'";
}

14. Reading
my @contents = <$fh>;
print @contents

15. Writing
open my $fh_out , '>' , ”output.txt”
or die $!;
for my $number ( 1 .. 9 ) {
print $fh_out “$numbern”;
}
close $fh_out
or die $!;

16. special variables
● $.
● $/
● $|

17. Directoris i Paths
opendir my $dir,”tasks/circus”;
while (my $task = readdir $dir){
next if /^./;
print “$taskn”;
}

18. ­X
● -f
● -d
● -r
● -z
● perldoc -f -r

19. rename
● rename OLDNAME,NEWNAME
rename $oldname,$newname
or die “No puc renombrar $oldname a $newname”

20. copy and move
● use File::Copy

21. unlink
unlink $filename
or die “No puc esborrar $filename. $!”;

22. chdir
chdir $directori
or die “No puc anar a $directori. $!”;

23. Executar codi
open my $fh, ”-|” , ”ls” or die $!;
while (<$fh>) {
print;
}
close $fh

24. Executar codi
open my $spam,'|-'
,'mailx -s “assumpte” algu@domini.edu'
or die $!;
for my $lletra ( a .. z ) {
print $spam “$lletran”;
}
close $spam;

25. close $show;

26. close $show or die $!;