Help with Bash piped while-read and a read user input at the same time
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read -p # -e promptline
do
if something happend on promptline then do this
if something happend serverline then do this
Read user input from /dev/tty, to avoid accidentally reading input from the pipe or file instead. /dev/tty will always be the current terminal, if any.
These 2 Users Gave Thanks to Corona688 For This Post:
Thanks, will this lock the while loop and wait for user input? I want the script to react and run the wile loop if something happens in the server.log file as well.
Quote:
Originally Posted by Corona688
Read user input from /dev/tty, to avoid accidentally reading input from the pipe or file instead. /dev/tty will always be the current terminal, if any.
I can not get it to work as it builds on that it comes data on file 'server.log' for the program to get to the prompt and there is no steady stream of data on that file.
Quote:
Originally Posted by Corona688
Yes, it will block.
Since it's bash, you could have it time out eventually if the user doesn't type anything ( read -t 1 userinput < /dev/tty )
No worries, I explain in greater detail. It might very well be that I do not understand you.
I have a process A that depends on two processes.
Process B is the one assigned to the file server.log
Process C is if a user writes something
If data comes from B or C should process A run
Pseudocode something like:
I do not know how to write something like this:
A problem with another solution like this is that it is locked on the tail line
And the same problem with a solution like this is that it is locked on the tail line
I hope I explained my problem better and if not do not hesitate to ask again.
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