Linux and DevOps

Linux tip of the day🐧 In Linux, the pipe(|) operator is very useful if you want to redirect the output of one command to serve as input to the next for further processing:

$ cat data.txt | grep "No such file"

However, this does not redirect the errors. So, if the file does not exist, the grep command above will not return a match. What if you want to redirect and process both errors and normal output🤔 This is where this "|&" redirection operator comes in handy. This operator sends both the standard output (stdout) and standard error (stderr) of the first command over a pipe to the standard input (stdin) of the second command. Take a look at this example:

$ cat data.txt |& grep "No such file"

Notice the difference, the grep command was able to get a match. The "|&" operator in bash is a shorthand for the "2>&1 |" redirection operator.

$ cmd-1 2>&1 | cmd-2

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