Open File Error Perl
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$filename =
Perl Read Line From File
"input.txt"; if (open my $in, "<", $filename) { # do your perl file handle thing here # no need to explicitly close the file } else { warn "Could not open file '$filename'. $!"; } # here the perl close file $in filehandle is not accessible anymore A more Perlish way to open a file and exit with error message if you could not open the file: examples/files/open_with_die.pl #!/usr/bin/perl use strict; use warnings; my $filename = "input.txt"; open(my $fh, "<", $filename) or die "Could not open file '$filename'. $!"; # do your thing here close $fh; Table of Contents (t) Indexed keywords (k) Copyright 2014 Gabor Szabo Last updated at 2016-10-04T08:08:00
How to get Help for Perl? Perl on the command line Core Perl documentation and CPAN module documentation POD - Plain Old Documentation Debugging Perl scripts Scalars Common Warnings and Error
Perl File Handling
messages in Perl Automatic string to number conversion or casting in Perl Conditional statements, perl open pipe using if, else, elsif in Perl Boolean values in Perl Numerical operators String operators: concatenation (.), repetition (x) undef, the
Perl Read File Into String
initial value and the defined function of Perl Strings in Perl: quoted, interpolated and escaped Here documents, or how to create multi-line strings in Perl Scalar variables Comparing scalars in Perl String functions: length, http://edumaven.com/perl-programming/open-file-error-handling lc, uc, index, substr Number Guessing game while loop Scope of variables in Perl Short-circuit in boolean expressions Files How to exit from a Perl script? Standard output, standard error and command line redirection Warning when something goes wrong What does die do? Writing to files with Perl Appending to files Open and read from text files Don't Open Files in the old way slurp mode - http://perlmaven.com/open-and-read-from-files reading a file in one step Lists and Arrays Perl for loop explained with examples Perl Arrays Processing command line arguments - @ARGV in Perl How to process command line arguments in Perl using Getopt::Long Advanced usage of Getopt::Long for accepting command line arguments Perl split - to cut up a string into pieces How to read a CSV file using Perl? join The year of 19100 Scalar and List context in Perl, the size of an array Reading from a file in scalar and list context STDIN in scalar and list context Sorting arrays in Perl Sorting mixed strings Unique values in an array in Perl Manipulating Perl arrays: shift, unshift, push, pop Reverse Polish Calculator in Perl using a stack Reverse an array, a string or a number The ternary operator in Perl qw - quote word Subroutines Subroutines and functions in Perl Variable number of parameters in Perl subroutines Understanding recursive subroutines - traversing a directory tree Hashes, arrays Hashes in Perl Creating a hash from an array in Perl Perl hash in scalar and list context How to sort a hash in Perl? Count the frequency of words in text using Perl Regular Expressions Introduction to Regex
PerlNews Q&A Tutorials Poetry RecentThreads NewestNodes Donate What'sNew on Mar 09, 2013 at 18:46UTC ( #1022605=perlquestion: print w/replies, xml ) Need Help?? ShermW0829 has asked for the wisdom of the Perl Monks concerning the following http://www.perlmonks.org/?node_id=1022605 question: I have opened, read from, and written to files using PERL in the past. Now I think I am doing the same thing but the open states the below answers. Found "linux_complete_command_set.txt" Unable to open linux_complete_command_set.txt: No such file or directo +ry [download] Below is the code. The file exists within the same directory where I am running the PERL file hence the open file "./". I tried running the file without the ./ with the same results. #! /usr/bin/perl -w use v5.14.2; use strict; my $file = "linux_complete_command_set.txt"; if ( -e "$file" ) { print "\"Found $file\"\n"; } open ( FH0, '<./$file' ) or die "Unable to open $file: $!\n"; while (