explanation for "if [ -s $filename ];" Post: 302345908

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elf32_getehdr

elf_getehdr(3E) 														   elf_getehdr(3E)

NAME

       elf_getehdr:  elf32_getehdr(), elf32_newehdr(), elf64_getehdr(), elf64_newehdr() - retrieve class-dependent object file header for elf32 or
       elf64 file

SYNOPSIS

       Command: [flag]... file... [library]...

DESCRIPTION

   32-bit Class File
       For a 32-bit class file, returns a pointer to an ELF header, if one is available for the ELF descriptor elf.  If no header exists  for  the
       descriptor,  allocates  a "clean" one, but it otherwise behaves the same as It does not allocate a new header if one exists already.  If no
       header exists (for one cannot be created (for a system error occurs, the file is not a 32-bit class file, or elf is  null,  both  functions
       return a null pointer.  The header includes the following members.

       automatically sets the bit (see elf_flag(3E)).  A program may use to inspect the identification bytes from a file.

   64-bit Class File
       For  a  64-bit class file, returns a pointer to an ELF header, if one is available for the ELF descriptor elf.  If no header exists for the
       descriptor, allocates a "clean" one, but it otherwise behaves the same as It does not allocate a new header if one exists already.   If	no
       header  exists  (for  one cannot be created (for a system error occurs, the file is not a 64-bit class file, or elf is null, both functions
       return a null pointer.  The header includes the following members.

       automatically sets the bit (see elf_flag(3E)).  A program may use to inspect the identification bytes from a file.

SEE ALSO

       elf(3E), elf_begin(3E), elf_flag(3E), elf_getident(3E).

																   elf_getehdr(3E)