I am trying to write the csv->print out put to a file, the filename I want to use is in $_ and the data prints out from the csv->print command correct on screen. I just can't work out how to get it in a file.
$_ = $ARGV[0];
s/^[^=]*=//;
while (#ARGV) {
my $file = shift;
open my $IN, '<', $file or die $!;
my $html = do { local $/; <$IN> };
$te->parse($html);
}
for my $table ($te->tables) {
#print $_."\n";
open (NEWCSV, '>> '.$_);
print NEWCSV $csv->print(*STDOUT{IO}, $_) for $table->rows;
close (NEWCSV);
}
Thanks
Just open a file for output, and use its filehandle instead of *STDOUT{IO}:
open my $FH, '>', 'file.csv';
$csv->print($FH, $_) for $table->rows;
Related
In Perl, I know this method :
open( my $in, "<", "inputs.txt" );
reads a file but it only does so if the file exists.
Doing the other way, the one with the +:
open( my $in, "+>", "inputs.txt" );
writes a file/truncates if it exists so I don't get the chance to read the file and store it in the program.
How do I read files in Perl considering if the file exists or not?
Okay, I've edited my code but still the file isn't being read. The problem is it doesn't enter the loop. Anything mischievous with my code?
open( my $in, "+>>", "inputs.txt" ) or die "Can't open inputs.txt : $!\n";
while (<$in>) {
print "Here!";
my #subjects = ();
my %information = ();
$information{"name"} = $_;
$information{"studNum"} = <$in>;
$information{"cNum"} = <$in>;
$information{"emailAdd"} = <$in>;
$information{"gwa"} = <$in>;
$information{"subjNum"} = <$in>;
for ( $i = 0; $i < $information{"subjNum"}; $i++ ) {
my %subject = ();
$subject{"courseNum"} = <$in>;
$subject{"courseUnt"} = <$in>;
$subject{"courseGrd"} = <$in>;
push #subjects, \%subject;
}
$information{"subj"} = \#subjects;
push #students, \%information;
}
print "FILE LOADED.\n";
close $in or die "Can't close inputs.txt : $!\n";
Use the proper test file operator:
use strict;
use warnings;
use autodie;
my $filename = 'inputs.txt';
unless(-e $filename) {
#Create the file if it doesn't exist
open my $fc, ">", $filename;
close $fc;
}
# Work with the file
open my $fh, "<", $filename;
while( my $line = <$fh> ) {
#...
}
close $fh;
But if the file is new (without contents), the while loop won't be processed. It's easier to read the file only if the test is fine:
if(-e $filename) {
# Work with the file
open my $fh, "<", $filename;
while( my $line = <$fh> ) {
#...
}
close $fh;
}
You can use +>> for read/append, creates the file if it doesn't exist but doesn't truncate it:
open(my $in,"+>>","inputs.txt");
First check whether the file exists or not. Check the sample code below :
#!/usr/bin/perl
use strict;
use warnings;
my $InputFile = $ARGV[0];
if ( -e $InputFile ) {
print "File Exists!";
open FH, "<$InputFile";
my #Content = <FH>;
open OUT, ">outfile.txt";
print OUT #Content;
close(FH);
close(OUT);
} else {
print "File Do not exists!! Create a new file";
open OUT, ">$InputFile";
print OUT "Hello World";
close(OUT);
}
Hi i'm very new to perl and i've got litle knowledge on it but i'm trying to create a script that conbines two .csv files into a new one
#!/usr/bin/env perl
use strict;
use warnings;
use Text::CSV_XS;
my #rows;
{ # Read the CSV file
my $csv = Text::CSV_XS->new() or die "Cannot use Text::CSV_XS ($!)";
my $file = "file.csv";
open my $fh, '<', $file or die "Cannot open $file ($!)";
while (my $row = $csv->getline($fh)) {
push #rows, $row;
}
$csv->eof or $csv->error_diag();
close $fh or die "Failed to close $file ($!)";
}
{ # Gather the data
foreach my $row (#rows) {
foreach my $col (#{$row}) {
$col = uc($col);
}
print "\n";
}
}
# (over)Write the data
# Needs to be changed to ADD data
{
my $csv = Text::CSV_XS->new({ binary => 1, escape_char => undef })
or die "Cannot use Text::CSV ($!)";
my $file = "output.csv";
open my $fh, '>', $file or die "Cannot open $file ($!)";
$csv->eol("\n");
foreach my $row (#rows) {
$csv->print($fh, \#{$row}) or die "Failed to write $file ($!)";
}
close $fh or die "Failed to close $file ($!)";
}
this is my current code i do know this over write's the data insted of actually adding it to the new file but this is how far i managed to get with the limited time and knowledge i've got on perl
the csv format of both files are the same.
"Header1";"Header2";"Header3";"Header4";"Header5"
"Data1";"Data2";"Data3";"Data4";"Data5"
"Data1";"Data2";"Data3";"Data4";"Data5"
"Data1";"Data2";"Data3";"Data4";"Data5"
"Data1";"Data2";"Data3";"Data4";"Data5"
"Data1";"Data2";"Data3";"Data4";"Data5"
I believe the issue is here:
open my $fh, '>', $file
or die "Cannot open $file ($!)";
If I remember my Perl properly, the line should read:
open my $fh, '>>', $file
or die "Cannot open $file ($!)";
The >> should open the file handle $fh for append instead of for overwrite.
you could try something like this
opendir(hand,"DIRPATH");
#files = readdir(hand);
closedir(hand);
foreach(#files){
if(/\.csv$/i) { #if the filename has .csv at the end
push(#csvfiles,$_);
}
}
foreach(#csvfiles) {
$csvfile=$_;
open(hanr,"DIRPATH".$csvfile)or die"error $!\n"; #read handler
open(hanw , ">>DIRPATH"."outputfile.csv") or die"error $! \n"; #write handler for creating new sorted files
#lines=();
#lines=<hanr>;
foreach $line (#lines){
chomp $line;
$count++;
next unless $count; # skip header i.e the first line containing stock details
print hanw join $line,"\n";
}
$count= -1;
close(hanw);
close(hanr);
}`
I want to extract the desired information from a file and append it into another. the first file consists of some lines as the header without a specific pattern and just ends with the "END OF HEADER" string. I wrote the following code for find the matching line for end of the header:
$find = "END OF HEADER";
open FILEHANDLE, $filename_path;
while (<FILEHANDLE>) {
my $line = $_;
if ($line =~ /$find/) {
#??? what shall I do here???
}
}
, but I don't know how can I get the rest of the file and append it to the other file.
Thank you for any help
I guess if the content of the file isn't enormous you can just load the whole file in a scalar and just split it with the "END OF HEADER" then print the output of the right side of the split in the new file (appending)
open READHANDLE, 'readfile.txt' or die $!;
my $content = do { local $/; <READHANDLE> };
close READHANDLE;
my (undef,$restcontent) = split(/END OF HEADER/,$content);
open WRITEHANDLE, '>>writefile.txt' or die $!;
print WRITEHANDLE $restcontent;
close WRITEHANDLE;
This code will take the filenames from the command line, print all files up to END OF HEADER from the first file, followed by all lines from the second file. Note that the output is sent to STDOUT so you will have to redirect the output, like this:
perl program.pl headfile.txt mainfile.txt > newfile.txt
Update Now modified to print all of the first file after the line END OF HEADER followed by all of the second file
use strict;
use warnings;
my ($header_file, $main_file) = #ARGV;
open my $fh, '<', $header_file or die $!;
my $print;
while (<$fh>) {
print if $print;
$print ||= /END OF HEADER/;
}
open $fh, '<', $main_file or die $!;
print while <$fh>;
use strict;
use warnings;
use File::Slurp;
my #lines = read_file('readfile.txt');
while ( my $line = shift #lines) {
next unless ($line =~ m/END OF HEADER/);
last;
}
append_file('writefile.txt', #lines);
I believe this will do what you need:
use strict;
use warnings;
my $find = 'END OF HEADER';
my $fileContents;
{
local $/;
open my $fh_read, '<', 'theFile.txt' or die $!;
$fileContents = <$fh_read>;
}
my ($restOfFile) = $fileContents =~ /$find(.+)/s;
open my $fh_write, '>>', 'theFileToAppend.txt' or die $!;
print $fh_write $restOfFile;
close $fh_write;
my $status = 0;
my $find = "END OF HEADER";
open my $fh_write, '>', $file_write
or die "Can't open file $file_write $!";
open my $fh_read, '<', $file_read
or die "Can't open file $file_read $!";
LINE:
while (my $line = <$fh_read>) {
if ($line =~ /$find/) {
$status = 1;
next LINE;
}
print $fh_write $line if $status;
}
close $fh_read;
close $fh_write;
I have to files like A.ini and B.ini ,I want to merge both the files in A.ini
examples of files:
A.ini::
a=123
b=xyx
c=434
B.ini contains:
a=abc
m=shank
n=paul
my output in files A.ini should be like
a=123abc
b=xyx
c=434
m=shank
n=paul
I want to this merging to be done in perl language and I want to keep the copy of old A.ini file at some other place to use old copy
A command line variant:
perl -lne '
($a, $b) = split /=/;
$v{$a} = $v{$a} ? $v{$a} . $b : $_;
END {
print $v{$_} for sort keys %v
}' A.ini B.ini >NEW.ini
How about:
#!/usr/bin/perl
use strict;
use warnings;
my %out;
my $file = 'path/to/A.ini';
open my $fh, '<', $file or die "unable to open '$file' for reading: $!";
while(<$fh>) {
chomp;
my ($key, $val) = split /=/;
$out{$key} = $val;
}
close $fh;
$file = 'path/to/B.ini';
open my $fh, '<', $file or die "unable to open '$file' for reading: $!";
while(<$fh>) {
chomp;
my ($key, $val) = split /=/;
if (exists $out{$key}) {
$out{$key} .= $val;
} else {
$out{$key} = $val;
}
}
close $fh;
$file = 'path/to/A.ini';
open my $fh, '>', $file or die "unable to open '$file' for writing: $!";
foreach(keys %out) {
print $fh $_,'=',$out{$_},"\n";
}
close $fh;
The two files to be merged can be read in a single pass and don't need to be treated as separate source files. That allows the use of <> to read all files passed as parameters on the command line.
Keeping a backup copy of A.ini is simply a matter of renaming it before writing the merged data to a new file of the same name.
This program appears to do what you need.
use strict;
use warnings;
my $file_a = $ARGV[0];
my (#keys, %values);
while (<>) {
if (/\A\s*(.+?)\s*=\s*(.+?)\s*\z/) {
push #keys, $1 unless exists $values{$1};
$values{$1} .= $2;
}
}
rename $file_a, "$file_a.bak" or die qq(Unable to rename "$file_a": $!);
open my $fh, '>', $file_a or die qq(Unable to open "$file_a" for output: $!);
printf $fh "%s=%s\n", $_, $values{$_} for #keys;
output (in A.ini)
a=123abc
b=xyx
c=434
m=shank
n=paul
I am looking for a way to launch a batch file if a particular string exists in a text file. For example - i want to check file.txt for the string 'working'. if it exists - i would like to launch a batch file.
use strict;
use warnings;
open my $fh, '<', $file or die "unable to open '$file' for reading :$!";
while(my $line = <$fh>){
chomp($line);
if($line =~ /working/){
my $result = qx/some.bat/; # use backtick or system()
last;
}
}
close($fh);
You can do something like this:
my $data = do {
open my $in, "<", "file.txt" or die "Could not open: $!";
local $/;
<$in>
};
if($data =~ /working/) {
system("cmd", "/c batch.cmd");
}