/usr/share/freemat/toolbox/test/strcattest.m is in freemat-data 4.0-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | function strcattest(str1,str2)
str3 = [str1,str2];
printf('str1 = %s, str2 = %s, str3 = %s\n',str1,str2,str3);
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