Bash store last line from displayed text output in a variable

carl0ski · 01-16-2007, 03:25 AM

Hi i wont to use Mplayers auto crop detect feature and save the outpu to a variable

mplayer dvd:/// -vf cropdetect

output

Code:

[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0
[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0
[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0
[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0
[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0
[CROP] Crop area: X: 0..703  Y: 0..303  (-vf crop=704:304:0:0).0 0

i've trimmed it down with this

mplayer dvd:/// -vf cropdetect|cut -d '(' -f 2|cut -d ')' -f 1|grep crop|tail

output

Code:

-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0
-vf crop=704:304:0:0

i hope to get only 1 of these lines stored as a variable

raskin · 01-16-2007, 03:38 AM

tail -1
will leave only last line of piped text

var=$(command)
will store command output