How do I redirect output and errors to /dev/null under bash / sh shell scripting? How do I redirect the output of stderr to stdout, and then redirect this combined output to /dev/null device? In Unix, how do I redirect error messages to /dev/null?

I have an application that logs a lot of noise to stderr and REALLY slows down the execution of the application. I would like to redirect that output to null. Is this possible with cmd.exe? Ls good bad /dev/null 2&1 You have to redirect stdout first before duplicating it into stderr; if you duplicate it first, stderr will just point to what stdout originally pointed at. Bash, zsh and some other shells also provide the shortcut. Ls good bad &/dev/null. 在Stevens的UNIX网络编程中,他提到重定向stdin,stdout和stderr,这在设置守护进程时是必需的.他使用以下C代码 /. redirect stdin, stdout, and stderr to /dev/null./ open.

You can send output to /dev/null, by using

Redirect Stderr To Dev Null Code

command >/dev/null syntax. However, this will not work when command will use the standard error (FD # 2). [donotprint][/donotprint]So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null.

Unix Redirect Output To Null

Syntax to redirect error and output messages to /dev/null

The syntax discussed below works with Bourne-like shells, such as sh, ksh, and bash:

OR

You can also use the same syntax for all your cronjobs to avoid emails and output / error messages:
@hourly /scripts/backup/nas.backup >/dev/null 2>&1
OR
@hourly /scripts/backup/nas.backup &>/dev/null

Redirect both standard error and standard out messages to a log file

Stdout And Stderr To File

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:

Want to close stdout and stderr for the command being executed on a Linux/Unix/BSD/OSX bash shell?

Try the following syntax:

See man pages: ksh(1)

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