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I have a list of pixel values in a file, and need each to be half its current value. The pattern for the value is always 123px where 123 varies drastically.
How can I half each pixel value?
I'm guessing sed will be helpful.
tbeseda
Posted 2011-05-13T17:28:06.230
Reputation: 101
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I would suggest you use awk instead of sed.
If your input file file.dat contains one entry per line this will work:
$ awk '{ print $1/2"px"}' file.dat
If you need more sophisticated math use gawk instead of awk.
Benjamin Bannier
Posted 2011-05-13T17:28:06.230
Reputation: 13 999
Looking into the awk docs now, but each value has exists on a line with other info and another value, like this (it's CSS):
.sprite-v16 { background-position: -462px -2002px; }– tbeseda – 2011-05-13T20:16:15.543This is more complicated than your question made it seem. While looking around I came across http://www.issociate.de/board/post/461416/Math_in_sed/regexp_expression.html, but it needs some adijustments for your case. Since CSS can contain simple calculations you could just replace
– Benjamin Bannier – 2011-05-14T13:50:14.213psby*0.5pxfor the time being:sed 's/px/\*0\.5px/g'.