Nov 13, 2016 The I/O stands for input/output and with this facility you can redirect the input and output of commands to and from files, as well as connect multiply. One way of doing this is prepending the number of the stream you wish to redirect to the redirection operatorlike this: Command 2 /dev/null. Hence, your command would look like: ping -q -c 1 google.com /dev/null 2 /dev/null && echo online echo offline But, notice that we have already redirected one stream to /dev/null. Why not simply. Apr 10, 2020 How to&Answers: It is possible to write STDOUT directly to a file in PHP, which is much easier and more straightforward than using output bufferering.
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?![Output Output](/uploads/1/2/6/0/126088363/718007855.png)
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- stdin – 0 – Standard Input (usually keyboard or file)
- stdout – 1 – Standard Output (usually screen)
- stderr – 2 – Standard Error (usually screen)
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What is a null (/dev/null) file in a Linux or Unix-like systems?
![How to redirect output to dev null in c file How to redirect output to dev null in c file](/uploads/1/2/6/0/126088363/142938244.jpg)
/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:
In this example, send output of find command to /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>/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).
How To Redirect Output To Dev Null In C B
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