Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting
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7.4. Nested if/then Condition Tests

Condition tests using the if/then construct may be nested. The net result is equivalent to using the && compound comparison operator.

   1 a=3
   2 
   3 if [ "$a" -gt 0 ]
   4 then
   5   if [ "$a" -lt 5 ]
   6   then
   7     echo "The value of \"a\" lies somewhere between 0 and 5."
   8   fi
   9 fi
  10 
  11 # Same result as:
  12 
  13 if [ "$a" -gt 0 ] && [ "$a" -lt 5 ]
  14 then
  15   echo "The value of \"a\" lies somewhere between 0 and 5."
  16 fi

Example 37-4 and Example 17-11 demonstrate nested if/then condition tests.

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