which of the following redirects stderr to /dev/null? course hero

How to redirect only the stderr to /dev/null?

If any other file were given instead of /dev/null, the standard output would have been written to that file. Similarly, to redirect only the STDERR to /dev/null, use the integer '2' instead of '1'. The integer '2' stands for standard error. $ mv -v tmp.c /etc/apt/sources.list /tmp 2>/dev/null

How to discard stdout and stderr at the same time?

Similarly, to redirect only the STDERR to /dev/null, use the integer '2' instead of '1'. The integer '2' stands for standard error. As you can see, the standard error is not displayed on the terminal now as it is discarded in /dev/null. Finally, to discard both STDOUT and STDERR at the same time, use the following:

What are stdout and stderr?

The output consists of two parts: STDOUT ( Standard Output ), which contains information logs and success messages, and STDERR ( Standard Error ), which contains error messages. Many times, the output contains a lot of information that is not relevant, and which unnecessarily utilizes system resources.

What would happen if a file was given instead of /dev/null?

If any other file were given instead of /dev/null, the standard output would have been written to that file.

What does 1 mean in Linux?

Here '1' indicates STDOUT, which is a standard integer assigned by Linux for the same. The operator '>', called a redirection operator, writes data to a file. The file specified in this case is /dev/null. Hence, the data is ultimately discarded.

Can /dev/null be discarded?

However in cases when the output is already known and anticipated, it can be discarded with /dev/null. If you have any questions or feedback, let us know in the comments below!

Can you redirect output to /dev/null?

The same can be used in either command or in complex Bash scripts which generate a heavy amount of log. In case if the script needs debugging, or has to be tested; in such cases, the log is required to view and analyze the errors properly.

What is stdout?

The stdout (stdout) is nothing but standard output used by a command to write its output on the screen. It is denoted by one ( 1) number.

What is stderr?

The standard error (stderr) is the default error output device, which is used to write all system error messages. It is denoted by two ( 2) number.

Conclusion

KSH redirection refers to changing the shell’s normal method of handling stdout , stdin, and stderr for Unix commands. KSH uses the following symbols for redirection purpose:

Powershell Stderr Redirect

You can always redirect both standard error (stdin) and standard out (stdout) text to an output file or a log file by typing the following command: