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I have a character device /dev/abc. I have to perform the read write operation to this character device from a shell script. how can I do it?
To read from the character device:
dd if=/dev/abc
To write to the character device:
echo "text" > /dev/abc
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I've been searching on the internet but I did not find the right answer, so, my question is, how can I run a Go program during 5 minutes and after this 5 minutes exit the script?
Add this line of code to the beginning of the main() function:
time.AfterFunc(5*time.Minute, func() { os.Exit(0) })
This causes os.Exit(0) to be called after 5 minutes.
Here it is on the Go playground (minutes convert to seconds for example): https://play.golang.org/p/wybKWM2BEep
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Iam writing go and I am having 300 go routines running at the same time.
When one of them crashes the print log becomes incredibly long and I endup scrolling up every time (I only need to see the last line of my log and the first go routine failing).
How are you making your developer experience nicer in go?
You can pipe the output of your program to a file
./program 2>&1 > log.txt
or to a program that lets you view the buffer head first
./program 2>&1 | less
The 2>&1 part combines stdout and stderr, so you get regular program output and error messages in the same buffer.
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I am looking for a way to stop the current running script and restart it if a continuation is met.
How can I do that?
Write like this:
at_exit{
# whatever way you started the program originally such as `program_name`.
# Make sure that the new process is detached from the original.
}
and then do:
exit
somewhere where you want to break.
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when I debug,I clean the log info frequently.
Is there any hotkey for that
If you mean the console window, its clover-K: ⌘-K I think.
Yes there is, it is:
⌃+⌥+⌘+R
Soure: http://www.1729.us/xcode/Xcode%20Shortcuts.pdf
control + option + command + R
You can use the above.
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when i keep pressing Keyboard key 'A' at NOTEPAD, it input about 25 'A' to notepad per second, what controls the speed of input characters ?
Notepad is a giant EditBox. It's controlled by the system setting.
To read or write this value programmatically, use SystemParametersInfo(). Check out the section for Input Parameters.