stderr

Difference between $stdout and STDOUT in Ruby

$stdout is a global variable that represents the current standard output. STDOUT is a constant representing standard output and is typically the default value of $stdout. With STDOUT being a constant, you shouldn’t re-define it, however, you can re-define $stdout without errors/warnings (re-defining STDOUT will raise a warning). for example, you can do: Same goes for $stderr and STDERR So, to answer the other part of your question, use the global variables … Read more

How I can print to stderr in C?

The syntax is almost the same as printf. With printf you give the string format and its contents ie: With fprintf it is the same, except now you are also specifying the place to print to: Or in your case:

STDERR? What is it? What are its common uses?

Usually you would use stderr for error messages. If you run a program on the command line, you can capture its stdout and/or stderr For example: will capture anything written by myprogram.exe to stdout and place it in stdout.txt. However, stuff written to stderr will not be put into stdout.txt. Thus you can capture the … Read more

Confused about stdin, stdout and stderr?

Standard input – this is the file handle that your process reads to get information from you. Standard output – your process writes conventional output to this file handle. Standard error – your process writes diagnostic output to this file handle. That’s about as dumbed-down as I can make it 🙂 Of course, that’s mostly by convention. There’s nothing stopping … Read more