Info Catalog coreutils: File characteristic tests coreutils: test invocation coreutils: Numeric tests

coreutils: String tests

 
 16.3.4 String tests
 -------------------
 
 These options test string characteristics.  You may need to quote STRING
 arguments for the shell.  For example:
 
      test -n "$V"
 
    The quotes here prevent the wrong arguments from being passed to
 ‘test’ if ‘$V’ is empty or contains special characters.
 
 ‘-z STRING’
      True if the length of STRING is zero.
 
 ‘-n STRING’
 ‘STRING’
      True if the length of STRING is nonzero.
 
 ‘STRING1 = STRING2’
      True if the strings are equal.
 
 ‘STRING1 == STRING2’
      True if the strings are equal (synonym for =).
 
 ‘STRING1 != STRING2’
      True if the strings are not equal.
 

Info Catalog coreutils: File characteristic tests coreutils: test invocation coreutils: Numeric tests