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Piping both stdout and stderr in bash?
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Bash has a shorthand for 2>&1 |, namely |&, which pipes both stdout and stderr (see the manual):
cmd-doesnt-respect-difference-between-stdout-and-stderr |& grep -i SomeError
This was introduced in Bash 4.0, see the release notes.
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Bash command to sum a column of numbers [duplicate]
I want a bash command that I can pipe into that will sum a column of numbers. I just want a quick one liner that will do something essentially like this:
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Redirect stdout pipe of child process in Go
...rminal
window where I started the parent program.
No need to mess with pipes or goroutines, this one is easy.
func main() {
// Replace `ls` (and its arguments) with something more interesting
cmd := exec.Command("ls", "-l")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.R...
Assign output of a program to a variable using a MS batch file
... This is a great trick, I wonder why it doesn't work with a pipe
– Bill K
Apr 10 '13 at 22:26
25
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How to get Linux console window width in Python
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tput is better than stty, as stty cannot work with PIPE.
– liuyang1
Jul 14 '15 at 12:35
5
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第二、三行为进程和CPU...
jQuery.ajax handling continue responses: “success:” vs “.done”?
...re (much cooler) things you can do with $.Deferred, one of which is to use pipe to trigger a failure on an error reported by the server, even when the $.ajax request itself succeeds. For example:
function xhr_get(url) {
return $.ajax({
url: url,
type: 'get',
dataType: 'json'
})
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How to pipe input to a Bash while loop and preserve variables after loop ends
... do not themselves create a subshell. In this context, they are part of a pipeline and are therefore run as a subshell, but it is because of the |, not the { ... }. You mention this in the question. AFAIK, you can do a return from within these inside a function.
Bash also provides the shopt buil...
How does the vim “write with sudo” trick work?
...tee.
Understanding tee
As for tee, picture the tee command as a T-shaped pipe in a normal bash piping situation: it directs output to specified file(s) and also sends it to standard output, which can be captured by the next piped command.
For example, in ps -ax | tee processes.txt | grep 'foo', ...
Bash variable scope
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The problem is that processes put together with a pipe are executed in subshells (and therefore have their own environment). Whatever happens within the while does not affect anything outside of the pipe.
Your specific example can be solved by rewriting the pipe to
while ....