The gnatls command has the form
$ gnatls switches `object_or_ali_file`
The main argument is the list of object or ali files
(see The Ada Library Information Files)
for which information is requested.
In normal mode, without additional option, gnatls produces a four-column listing. Each line represents information for a specific object. The first column gives the full path of the object, the second column gives the name of the principal unit in this object, the third column gives the status of the source and the fourth column gives the full path of the source representing this unit. Here is a simple example of use:
$ gnatls *.o
./demo1.o demo1 DIF demo1.adb
./demo2.o demo2 OK demo2.adb
./hello.o h1 OK hello.adb
./instr-child.o instr.child MOK instr-child.adb
./instr.o instr OK instr.adb
./tef.o tef DIF tef.adb
./text_io_example.o text_io_example OK text_io_example.adb
./tgef.o tgef DIF tgef.adb
The first line can be interpreted as follows: the main unit which is
contained in
object file demo1.o is demo1, whose main source is in
demo1.adb. Furthermore, the version of the source used for the
compilation of demo1 has been modified (DIF). Each source file has a status
qualifier which can be: