How do I redirect standard output to a file?

2 Answers

1. Redirect stdout to one file and stderr to another file: command > out 2>error.
2. Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): command >out 2>&1.

Which command will direct both standard output and standard error to the file Dirlist?

ls 2>&1 > dirlist will only direct standard output to dirlist. This can be a useful option for programmers. The first command that nancy executes is correct (eventhough no errors are generated and thus the file to which standard error is redirected is empty).

How redirect standard output in Linux?

command > output is just a shortcut for command 1> output ; You can use &[FILE_DESCRIPTOR] to reference a file descriptor value; Using 2>&1 will redirect stderr to whatever value is set to stdout (and 1>&2 will do the opposite).

How do you redirect output?

On a command line, redirection is the process of using the input/output of a file or command to use it as an input for another file. It is similar but different from pipes, as it allows reading/writing from files instead of only commands. Redirection can be done by using the operators > and >> .

What happens if I first redirect STDOUT to a file and then redirect stderr to the same file?

When you redirect both standard output and standard error to the same file, you may get some unexpected results. This is due to the fact that STDOUT is a buffered stream while STDERR is always unbuffered.

Which symbol should I use to redirect the error output to the standard output?

The regular output is sent to Standard Out (STDOUT) and the error messages are sent to Standard Error (STDERR). When you redirect console output using the “>” symbol, you are only redirecting STDOUT. In order to redirect STDERR you have to specify “2>” for the redirection symbol.

What is the difference between standard error and standard output ‘?

The standard output stream is typically used for command output, that is, to print the results of a command to the user. The standard error stream is typically used to print any errors that occur when a program is running.

How do you redirect an error?

When you redirect console output using the > symbol, you are only redirecting STDOUT. In order to redirect STDERR, you have to specify 2> for the redirection symbol.

What happens if I first redirect stdout to a file and then redirect stderr to the same file?

What command do you use to redirect runtime errors to a file?

2> is input redirection symbol and syntax is:

1. To redirect stderr (standard error) to a file: command 2> errors.txt.
2. Let us redirect both stderr and stdout (standard output): command &> output.txt.
3. Finally, we can redirect stdout to a file named myoutput.txt, and then redirect stderr to stdout using 2>&1 (errors.txt):

What is the difference between standard output and error output?

What is used to redirect the standard error?

Redirecting Standard Error and Other Output If you want to redirect standard input or standard output, you can use the <, >, or > > symbols.

How to redirect stdout and stderr to syslog?

What I have in my startup script is thie: This is redirecting the stdout to syslog just fine but stderr is coming to the console, so I need to refine the command. You need to combine the output of STDERR and STDOUT prior to piping it to logger. Try this instead: NOTE: This is equivalent to 2>&1 | .

What does redirecting bash script output to syslog do?

If COMMAND is not specified, any redirections take effect in the current shell. In this case exec is being used without COMMAND – this line is redirecting I/O for the current shell. So what do the redirections do?

How to redirect output of systemd service to a?

Takes one of inherit, null, tty, journal, syslog, kmsg, journal+console, syslog+console, kmsg+console or socket. The systemd.exec (5) man page explains other options related to logging. See also the systemd.service (5) and systemd.unit (5) man pages.

How to redirect stdout and stderr to different processes?

The first part ( echo info; >&2 echo critical ) simulate a program that output both on stdout and stderr. The trick with 2>&3 come from that answer, to be able to output stdout and stderr to different processes. You could observe the result with journalctl -f with a Linux with systemd.