/usr/share/aqsis/shaders/surface/randgrid.slx is in aqsis 1.8.1-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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AQSIS_V 2
segment Data
USES 460806
param uniform float Ka
param uniform float Kd
param uniform float Ks
param uniform float roughness
param uniform color specularcolor
uniform color c
varying point Nf
segment Init
pushif 1
pop Ka
pushif 0.5
pop Kd
pushif 0.5
pop Ks
pushif 0.100000001
pop roughness
pushif 1
setfc
pop specularcolor
segment Code
pushv I
pushv N
normalize
faceforward
pop Nf
frandom
frandom
frandom
settc
pop c
pushv Os
pop Oi
pushv roughness
pushv I
normalize
negp
pushv Nf
specular
pushv Ks
setfc
pushv specularcolor
mulcc
mulcc
pushv Nf
diffuse
pushv Kd
mulfc
ambient
pushv Ka
mulfc
addcc
pushv c
mulcc
addcc
pushv Os
mulcc
pop Ci
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