[PATCH] Use grep -i version instead of head -n1 in linux launch script

[Revnoplex <revnoplex.business@…>]

Hi, I have a suggestion that the snippet used to determine the current java version on the system in the linux launch script be changed to used grep -i version instead of head -n1 in the java_version function on line 43 of the linux launch script:

${1} -version 2>&1 | head -n1 | awk -F'"' '{print $2}' | awk -F'.' '{print $1}'

I am suggesting this because when the environmental variable JDK_JAVA_OPTIONS is set, the first thing the java -version command prints instead of the version line:

NOTE: Picked up JDK_JAVA_OPTIONS: -Dsun.java2d.uiScale=2 -Dglass.gtk.uiScale=170%

And that causes the version function to fail which then causes this condition:

if [[ "${JAVA_VERSION}" -ge 11 ]]; then

to fail which leaves out

JAVA_OPTS="$JAVA_OPTS --add-exports=java.base/sun.security.action=ALL-UNNAMED"
JAVA_OPTS="$JAVA_OPTS --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED"
JAVA_OPTS="$JAVA_OPTS --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED"

Which then JOSM complains about on launch:

Missing JVM Arguments: 
--add-exports=java.base/sun.security.action=ALL-UNNAMED 
--add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED 
--add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED 
These arguments should be added in the command line or start script before the -jar parameter.

My proposal is to use grep -i version to get the correct line
as suggested by ​https://stackoverflow.com/a/27339694