How can I get the architecture of a binary file?

How can I get the architecture of a binary file.txt

How can I get the architecture of a binary file?
readelf -h <archive>.a | grep 'Class\|File\|Machine'

[00:32:15] /usr/lib $ readelf -h libxslt.a | grep 'Class\|File\|Machine'
File: libxslt.a(attrvt.o)
  Class:                             ELF32
  Machine:                           Intel 80386
File: libxslt.a(xslt.o)
  Class:                             ELF32
  Machine:                           Intel 80386
... #Trimmed this, it goes on a bit
File: libxslt.a(transform.o)
  Class:                             ELF32
  Machine:                           Intel 80386
File: libxslt.a(security.o)
  Class:                             ELF32
  Machine:                           Intel 80386
  
  
  
  readelf -h /home.local/stanislavp/toolchain_extracted/toolchain_extracted/usr/bin/as|  grep 'Class\|File\|Machine'
  Class:                             ELF64
  Machine:                           Advanced Micro Devices X86-64