Specifying 2>/dev/null will filter out the errors so that they will not be output to your console. In more detail: 2 represents the error descriptor, which is where errors are written to. By default they are printed out on the console. > redirects output to the specified place, in this case /dev/null.
What is dev null 2 dev null?
2>&1 redirects standard fout to standard output. &1 indicates file descriptor (standard output), otherwise (if you use just 1 ) you will redirect standard error to a file named 1 . [any command] >>/dev/null 2>&1 redirects all standard error to standard output, and writes all of that to /dev/null .
Wat beteken >/ dev null 2 >& 1?
So in a sentence “1>/dev/null 2>&1” after a command means, that every Standard Error will be forwarded to the Standard Output and this will be also forwarded to a black hole where all information is lost.
What is 2 >/ dev null in bash?
Die N>-sintaksis in Bash beteken om 'n lêerbeskrywing na iewers anders te herlei. 2 is die lêerbeskrywer van stderr , en hierdie voorbeeld herlei dit na /dev/null . Wat dit in eenvoudige terme beteken: ignoreer foutuitvoer van die opdrag.
What does dev null mean in Linux?
/dev/null is the null file. Anything written to it is discarded. Together they mean “throw away any error messages".
Can I read from dev Null?
You write to /dev/null every time you use it in a command such as touch file 2> /dev/null. You read from /dev/null every time you empty an existing file using a command such as cat /dev/null > bigfile or just > bigfile. Because of the file’s nature, you can’t change it in any way; you can only use it.
Is writing to dev Null faster?
If a script or program produces lots of output, generally, a reduction of the amount of output will make things run faster. The most radical reduction often seen at the command line is a redirection to /dev/null . However, this can be done in various ways with rather varying results.
Is dev null a file?
To begin, /dev/null is a special file called the null device in Unix systems. Colloquially it is also called the bit-bucket or the blackhole because it immediately discards anything written to it and only returns an end-of-file EOF when read.
What is the null command?
The null command is a THEN or ELSE command that is not followed by a command continuation character. If THEN or ELSE is not followed by either a continuation character or by a command in the same record, the THEN or ELSE results in no action.
Wat beteken 2 in Linux?
38. Lêerbeskrywer 2 verteenwoordig standaard fout. (ander spesiale lêerbeskrywings sluit 0 in vir standaardinvoer en 1 vir standaarduitvoer). 2> /dev/nul beteken om standaardfout na /dev/null te herlei. /dev/null is 'n spesiale toestel wat alles wat daaraan geskryf is, weggooi.
What does 2 >> mean?
&1 word gebruik om die waarde van die lêerbeskrywer 1 (stdout) te verwys. Nou na die punt 2>&1 beteken “Herlei die stderr na dieselfde plek waar ons die stdout herlei”
What is 2 NUL?
Standard output is going to nul and standard fout output (file descriptor 2) is being sent to standard output (file descriptor 1) so both error and normal output go to the same place. In Windows, nul is a null device, which means the output is just flushed and you don’t see it.
How do I send a message to dev Null?
In Unix, how do I redirect error messages to /dev/null? You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will use the standard error (FD # 2). So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null.