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if [ $UID -gt 199 ] && [ "`/usr/bin/id -gn`" = "`/usr/bin/id -un`" ]; 
+then
    umask 002
else
    umask 022
fi

my @archivos = $cgi->param("archivos");
my $inst = $cgi->param("inst");
...
my @nombre_archivos = ("NI","RP","RDZ","CRF");
my $upload_dir = "/var/www/html/public_html/rev/$inst/$anio-$mes-$dia"
+;
mkdir $upload_dir, 0775;

#/var/www/html
drwxr-xr-x.  5 apache apache    4096 Dec 20 15:00 public_html

Software error:

No such file or directory at /var/www/cgi-bin/programs/upload_modif_ok
+.cgi line 49.

open ( UPLOADFILE, ">$upload_dir/$anio-$mes-$dia-$nombre_archivos[$ind
+]" ) or die "$!";

For help, please send mail to the webmaster (root@localhost), giving t
+his error message and the time and date of the error.

[Tue Jan 08 09:43:34.876310 2019] [cgi:error] [pid 31695] [client...] 
+AH01215: [Tue Jan  8 09:43:34 2019] upload_modif_ok.cgi: No such file
+ or directory at /var/www/cgi-bin/programs/upload_modif_ok.cgi line 4
+9., referer: http://...