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4 – stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input Part 9 – Logging Part 10 http://steve-jansen.github.io/guides/windows-batch-scripting/part-4-stdin-stdout-stderr.html – Advanced Tricks DOS, like Unix/Linux, uses the three universal “files” for keyboard input, printing text on the screen, and the printing errors on the screen. The “Standard In” file, known as stdin, contains http://perlmaven.com/stdout-stderr-and-redirection the input to the program/script. The “Standard Out” file, known as stdout, is used to write output for display on the screen. Finally, the “Standard Err” file, known as stderr, contains any error messages error output for display on the screen. File Numbers Each of these three standard files, otherwise known as the standard streams, are referernced using the numbers 0, 1, and 2. Stdin is file 0, stdout is file 1, and stderr is file 2. Redirection A very common task in batch files is sending the output of a program to a log file. The > operator sends, or redirects, stdout or redirect error output stderr to another file. For example, you can write a listing of the current directory to a text file: DIR > temp.txt The > operator will overwrite the contents of temp.txt with stdout from the DIR command. The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. A common technique is to use > to create/overwrite a log file, then use >> subsequently to append to the log file. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. You can redirect stderr by using the file number 2 in front of the operator: DIR SomeFile.txt 2>> error.txt You can even combine the stdout and stderr streams using the file number and the & prefix: DIR SomeFile.txt 2>&1 This is useful if you want to write both stdout and stderr to a single log file. DIR SomeFile.txt > output.txt 2>&1 To use the contents of a file as the input to a program, instead of typing the input from the keyboard, use the < operator. SORT < SomeFile.txt Suppressing Program Output The pseudofile NUL is used to discard any output from a program. Here is an exam
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 messages in Perl Automatic string to number conversion or casting in Perl Conditional statements, using if, else, elsif in Perl Boolean values in Perl Numerical operators String operators: concatenation (.), repetition (x) undef, the 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, 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 - 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 Regexes in Perl 5 Regex character classes Regex: special character classes Perl 5 Regex Quantifiers trim - removing leading and trailing white spaces with Perl Perl and Shell related functionality How to remove, cop