Advanced Bash-Scripting Guide:
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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 above.

if [ condition1 ]
then
  if [ condition2 ]
  then
    do-something  # But only if both "condition1" and "condition2" valid.
  fi  
fi

See Example 34-4 for an example of nested if/then condition tests.

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