I would like to make this command xrandr -s 640x480 use variables like so
#!/bin/bash
display_x=640
display_y=480
xrandr -s $display_xx$display_y
The command does not run correctly. How can I do this?
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2 Answers
#!/bin/bash
display_x=640
display_y=480
xrandr -s ${display_x}x${display_y}
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Oh, braces, I saw that somewhere online. Thank you sir.xinthose– xinthose2017-08-08 02:54:30 +00:00Commented Aug 8, 2017 at 2:54
You should always put shell variables into quotes unless you have a good reason not to, and you’re sure you know what you’re doing. So Deathgrip’s answer should be
xrandr -s "${display_x}x${display_y}"
and that is the way I would probably do it. But
xrandr -s "$display_x"x"$display_y"
will also work. Here’s another approach:
display_x=640
display_y=480
x=x
xrandr -s "$display_x$x$display_y"
— anything to tell the shell
that you’re not trying to reference a variable named display_xx.
answered Aug 8, 2017 at 5:20
Scott - Слава Україні
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