Perl Poetry with IO syntax

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 $!;