What does Dev null 2 >& 1 means?

What does Dev null 2 >& 1 means?

/dev/null is a special filesystem object that discards everything written into it. Redirecting a stream into it means hiding your program’s output. The 2>&1 part means “redirect the error stream into the output stream”, so when you redirect the output stream, error stream gets redirected as well.

What is Dev null in bash?

< /dev/null is used to instantly send EOF to the program, so that it doesn’t wait for input ( /dev/null , the null device, is a special file that discards all data written to it, but reports that the write operation succeeded, and provides no data to any process that reads from it, yielding EOF immediately).

What is the use of script command in Linux?

script command in Linux is used to make typescript or record all the terminal activities. After executing the script command it starts recording everything printed on the screen including the inputs and outputs until exit.

What means 2 >/ dev null?

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 used for?

The most common use of /dev/null is to get rid of standard out, standard error, or both. Selecting which data source you want to squelch is easy. Get rid of standard output with commands like echo hello > /dev/null or echo hello 1> /dev/null.

What happens when you write to Dev Null?

Whatever you write to /dev/null will be discarded, forgotten into the void. It’s known as the null device in a UNIX system.

What does script Dev null do?

script /dev/null prevent any message from appearing on your screen. It supresses the messages, byt directing them to the “black hole.”

What is the purpose of Dev null in Linux?

Usage. The null device is typically used for disposing of unwanted output streams of a process, or as a convenient empty file for input streams. This is usually done by redirection. The /dev/null device is a special file, not a directory, so one cannot move a whole file or directory into it with the Unix mv command.

How does script command work?

The script command keeps action log for various tasks. The script records everything in a session such as things you type, things you see. To do this you just type script command on the terminal and type exit when finished. Everything between the script and the exit command is logged to the file.

What is script command?

Filters. A file of instructions that are performed by Windows. Using the . CMD file extension, command scripts are Windows “batch files,” which differ from applications in machine language that are executed directly by the computer.

What is function of Dev Null in Linux?

/dev/null in Linux is a null device file. This will discard anything written to it, and will return EOF on reading. This is a command-line hack that acts as a vacuum, that sucks anything thrown to it.

What does Dev Null do in Linux?