(coreutils.info.gz) File characteristic tests

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 16.3.3 File characteristic tests
 --------------------------------
 
 These options test other file characteristics.
 
 '-e FILE'
      True if FILE exists.
 
 '-s FILE'
      True if FILE exists and has a size greater than zero.
 
 'FILE1 -nt FILE2'
      True if FILE1 is newer (according to modification date) than FILE2,
      or if FILE1 exists and FILE2 does not.
 
 'FILE1 -ot FILE2'
      True if FILE1 is older (according to modification date) than FILE2,
      or if FILE2 exists and FILE1 does not.
 
 'FILE1 -ef FILE2'
      True if FILE1 and FILE2 have the same device and inode numbers,
      i.e., if they are hard links to each other.
 

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(coreutils.info.gz) Access permission tests

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(coreutils.info.gz) String tests