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Mega-X 07-03-2014 06:18 PM
Grep issue with ls --color=always on terminator
 
Hello everybody. :)

If I open up a terminal (I use terminator) and I try something like

Code:
ls --color=always /dev/sda* | grep '[0-9]'
I end up with the following wrong and yellow-colored output:

Code:
/dev/sda
/dev/sda1
/dev/sda2
/dev/sda3
/dev/sda4
/dev/sda5
otherwise if I type in
Code:
ls --color=never /dev/sda* | grep '[0-9]'
I have the correct output:

Code:
/dev/sda1
/dev/sda2
/dev/sda3
/dev/sda4
/dev/sda5
Can you explain me this strange behavior? Thanks in advance. :)

EDIT:

The same applies if I type
Code:
ls --color=always /dev/sda* | grep '0'

syg00 07-03-2014 07:09 PM
Neither of the outputs is wrong - you got what you asked for. An obvious line of endeavour would be to see what the colour codes generate.
Most notably how many, and which, contains a zero character.

Habitual 07-04-2014 09:07 AM
reported above post.

Mega-X 07-05-2014 11:57 AM
Quote:
Originally Posted by syg00 (Post 5198276)
Neither of the outputs is wrong - you got what you asked for. An obvious line of endeavour would be to see what the colour codes generate.
Most notably how many, and which, contains a zero character.
I tried the same piece of code on a slackware terminal and I got the "right" result without the "wrong" /dev/sda, so I guess it is a matter regarding the terminal I'm using.

Firerat 07-05-2014 12:26 PM
It is because the colour code contains a digit

try this

Code:
ls --color=always /dev/sda* |cat -A -
You will see the extra digits in the codes
which the term renders to colour
Code:
[[0m^[[40;33;01m/dev/sda^[[0m$
[[40;33;01m/dev/sda1^[[0m$
[[40;33;01m/dev/sda2^[[0m$
[[40;33;01m/dev/sda3^[[0m$
[[40;33;01m/dev/sda4^[[0m$
[[40;33;01m/dev/sda5^[[0m$
[[40;33;01m/dev/sda6^[[0m$
Change the grep to,
Code:
grep 'a[1-9]'
However, I don't know how slackware 'fixes' it 'transparently'


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