Q. How do I redirect stderr to stdout? How do I redirect stderr to a file?
A. Bash and other modern shell provides I/O redirection facility. There are 3 default standard files (standard streams) open:
[a] stdin – Use to get input (keyboard) i.e. data going into a program.

1. Csh Stderr To Dev/null
2. Powershell Redirect Stderr To Null
3. Linux Redirect Error To Null

[b] stdout – Use to write information (screen)

@cnicutar It seemed I have a wrong understanding in the start. I supposed 2&1 will redirect stderr to stdout and the 1/dev/null will then redirect both them into /dev/null. Well I need to relearn some shell. – Shou Ya Aug 19 '12 at 14:26. /dev-c-compiler-not-showing.html. Mar 12, 2008  Actually it means “first redirect STDERR to STDOUT, so any errors printed out on STDERR should go to STDOUT. Then, execute ‘command’ and redirect its STDOUT to ‘file-name'” – keeping in mind that at this point STDOUT will also contain whatever is written to STDERR. Aug 15, 2019  Redirecting stdout and stderr to the Same File. That’s neat, we’ve got each of the standard output streams going to its own dedicated file. To have the output of a stream redirected and silently thrown away, direct the output to /dev/null. Detecting Redirection Within a Script.

[c] stderr – Use to write error message (screen)

Understanding I/O streams numbers

The Unix / Linux standard I/O streams with numbers:

Redirecting the standard error stream to a file

The following will redirect program error message to a file called error.log:
$ program-name 2> error.log
$ command1 2> error.log

Redirecting the standard error (stderr) and stdout to file

Csh Stderr To Dev/null

Use the following syntax:
$ command-name &>file
OR
$ command > file-name 2>&1
Another useful example:
# find /usr/home -name .profile 2>&1 more

Powershell Redirect Stderr To Null

Redirect stderr to stdout

Linux Redirect Error To Null

Use the command as follows:
$ command-name 2>&1

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