Hello everyone, I am facing a situation that I have not yet been able to find a solution for. There is a client machine that is running a parallel job that generates an output file over time. The problem is that a file with the same name is being generated. There are two files with the same name and different dates. See: # ls -la drwxr-xr-x 5 userxxx groupyyy 12 May 6 23:11 . drwxr-xr-x 19 userxxx groupyyy 74 May 6 14:13 .. -rw-r--r-- 1 userxxx groupyyy 53274 May 3 16:48 lixo -rw-r--r-- 1 userxxx groupyyy 1317 May 3 16:33 mos2_bands.in -rw-r--r-- 1 userxxx groupyyy 54370 May 3 16:49 mos2_nscf.in -rw-r--r-- 1 userxxx groupyyy 2242 May 6 17:16 mos2_nscf.out -rw-r--r-- 1 userxxx groupyyy 1865 May 3 17:28 mos2_nscf.out -rw-r--r-- 1 userxxx groupyyy 1132 May 3 16:43 mos2_scf.in -rw-r--r-- 1 userxxx groupyyy 30626 May 6 17:16 mos2_scf.out -rw-r--r-- 1 userxxx groupyyy 30287 May 3 17:27 mos2_scf.out In POSIX semantics, inside a directory structure, two files/directories with the same name should be not allowed. But when I "change" the ls command, this situation no longer appears. See: # ls -la *out -rw-r--r-- 1 userxxx groupyyy 2242 May 6 17:16 mos2_nscf.out -rw-r--r-- 1 userxxx groupyyy 30626 May 6 17:16 mos2_scf.out This way of running ls, files with the same name do not appear. I currently have a new server in the cluster that is still in the backfill process. This situation could cause this problem. Could you help me identify the problem? Thanks Rafael.