ariaman5's questions

I'm using grep on Ubuntu Desktop 20.04.

I want to get player movements from gnuchess game by using grep each turn. The first command i used is this :

gnuchess -mq | grep -a "Black ([0-9][0-9]*) : [0-9][0-9]*. [a-z][0-9]" | grep "[a-z][0-9]"

for the first grep, if movements are 'e3' and 'e5', the output is :

Black (1) : 1. e5

I expect the second grep give me e5 but it doesn't. Output is blank.

Yet when i redirect gnuchess output to a file and use the same command it works and shows e5. Why?

Edit:

The problem was with output buffering. Added my answer below.

I recently Upgraded Ubuntu from 18.04 to 20.04 LTS on an Asus laptop, but from beginning i couldn't type certain characters like s, m, n or even space. Instead these act like shortcuts.

For example when i only press p, it does super + p which changes the display mode. I can only type characters which there is no super + key shortcut for them.

It's not a hardware problem since my keyboard works fine with unity and windows. How can i solve it?

I want a variable to be incremented by 1 per second.

#!/bin/bash
var=0
watch -n 1 echo "$((var++))" 

Output (after few seconds) :

Every 1.0s: echo 0
0

It didn't change on screen but when i enter echo "$var" output is 1.Why?