/usr/share/doc/gmt/examples/ex30/example_30.sh is in gmt-examples 5.2.1+dfsg-3build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# GMT EXAMPLE 30
# $Id: example_30.sh 11641 2013-06-07 00:06:36Z pwessel $
#
# Purpose: Show graph mode and math angles
# GMT progs: gmtmath, psbasemap, pstext and psxy
# Unix progs: echo, rm
#
# Draw generic x-y axes with arrows
ps=example_30.ps
gmt psbasemap -R0/360/-1.25/1.75 -JX8i/6i -Bx90f30+u"\\312" -By1g10 -BWS+t"Two Trigonometric Functions" \
-K --MAP_FRAME_TYPE=graph --MAP_VECTOR_SHAPE=0.5 > $ps
# Draw sine an cosine curves
gmt gmtmath -T0/360/0.1 T COSD = | gmt psxy -R -J -O -K -W3p >> $ps
gmt gmtmath -T0/360/0.1 T SIND = | gmt psxy -R -J -O -K -W3p,0_6:0 --PS_LINE_CAP=round >> $ps
# Indicate the x-angle = 120 degrees
gmt psxy -R -J -O -K -W0.5p,- << EOF >> $ps
120 -1.25
120 1.25
EOF
gmt pstext -R -J -O -K -Dj0.2c -N -F+f+j << EOF >> $ps
360 1 18p,Times-Roman RB x = cos(@%12%a@%%)
360 0 18p,Times-Roman RB y = sin(@%12%a@%%)
120 -1.25 14p,Times-Roman LB 120\\312
370 -1.35 24p,Symbol LT a
-5 1.85 24p,Times-Roman RT x,y
EOF
# Draw a circle and indicate the 0-70 degree angle
echo 0 0 | gmt psxy -R-1/1/-1/1 -Jx1.5i -O -K -X3.625i -Y2.75i -Sc2i -W1p -N >> $ps
gmt psxy -R -J -O -K -W1p << EOF >> $ps
> x-gridline -Wdefault
-1 0
1 0
> y-gridline -Wdefault
0 -1
0 1
> angle = 0
0 0
1 0
> angle = 120
0 0
-0.5 0.866025
> x-gmt projection -W2p
-0.3333 0
0 0
> y-gmt projection -W2p
-0.3333 0.57735
-0.3333 0
EOF
gmt pstext -R -J -O -K -Dj0.05i -F+f+a+j << EOF >> $ps
-0.16666 0 12p,Times-Roman 0 CT x
-0.3333 0.2888675 12p,Times-Roman 0 RM y
0.22 0.27 12p,Symbol -30 CB a
-0.33333 0.6 12p,Times-Roman 30 LB 120\\312
EOF
echo 0 0 0.5i 0 120 | gmt psxy -R -J -O -Sm0.15i+e -W1p -Gblack >> $ps
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