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• Redirect Stderr To Dev Null Converter
• Redirect Output To Dev Null
• Tcsh Redirect Stderr To Dev Null
• Linux Redirect Error To Null

The usual workaround is to execute the command in a sub-shell, redirecting stdout in that sub-shell to whatever file you want (/dev/null in this case), and then use the & operator to redirect stdout and stderr of the sub-shell to the next command in the main shell. I wonder if this is the right way to redirect stdout, stderr and stdin to /dev/null: SNIP This won't work, all you're doing is redirecting the stdio handles for stdout/err/in, not closing the actually file descriptors. When I examine such program with lsof I can see: redir 25055 trip 0r CHR 1,3 66788 /dev/null. STDERR redirects to THE ADDRESS of STDOUT (File descriptor 1 in that moment, or /proc/self/fd/1), and then STDOUT redirects to /dev/null, but STDERR keeps redirecting to fd1!! As a result the normal output from STDOUT is discarded, but the errors coming from STDERR are still being written onto the console. Jun 05, 2014  What is a null (/dev/null) file in a Linux or Unix-like systems? /dev/null is nothing but a special file that discards all data written to it. The length of the null device is always zero. In this example, first, send output of date command to the screen and later to the /dev/null.

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.

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

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Redirect Stderr To Dev Null Converter

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

Understanding I/O streams numbers

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

Handle	Name	Description
0	stdin	Standard input
1	stdout	Standard output
2	stderr	Standard error

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

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

Redirect stderr to stdout

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

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I‘m a new Linux system user. How can I redirect command error output /dev/null on a Linux or Unix-like system using Bash shell?

Redirect Output To Dev Null

Your shell comes with three file descriptors as follows:

1. stdin – 0 – Standard Input (usually keyboard or file)
2. stdout – 1 – Standard Output (usually screen)
3. stderr – 2 – Standard Error (usually screen)

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What is a null (/dev/null) file in a Linux or Unix-like systems?

Tcsh Redirect Stderr To Dev Null

/dev/null is nothing but a special file that discards all data written to it. The length of the null device is always zero. In this example, first, send output of date command to the screen and later to the /dev/null i.e. discards date command output:

Syntax: Standard Error (stderr -2 no) to a file or /dev/null

The syntax is as follows:

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In this example, send output of find command to /dev/null:
$ find /etc -type f -name '*' 2>/dev/null
The following example will cause the stderr ouput of a program to be written to a file called errors.txt:
$ find /etc/ -type f -name '*' 2> errors.txt

Linux and Unix redirect all output and error to file

The syntax is:

If you want both stderr and stdout in same file, try:

Use cat command to display log.txt on screen:
cat log.txt

See man pages for more information – ksh(1).

Linux Redirect Error To Null

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