Given the following shell variable assignments,

a=10; b=5; c=3

Which of the following conditions is true?

Question

Given the following shell variable assignments,

a=10; b=5; c=3

Which of the following conditions is true?

BlackTom AI · Accepted Answer

Question restatement: Given the shell variable assignments a=10; b=5; c=3, which of the following conditions is true?

Option 1: [ $c = ( 5 – 2 ) ]
- This tries to compare c to the result of ( 5 – 2 ). In shell, the expression ( 5 – 2 ) is not a valid arithmetic expression inside [ ... ]; arithmetic should be performed with $(( ... )) or inside let. Even if you intended arithmetic, you'd need to use $((5-2)) and a proper comparison form like [ $c -eq $((5-2)) ]. Additionally, the dash used in the option is not the standard minus symbol, which could cause a syntax error. As written, this is not a valid, reliably true test, so we treat it as false or invalid.

Option 2: [ b –gt 1 ]
- Here, the variable is referenced as b without the leading $, so the test is comparing the literal string 'b' to the numeric 1. In shell, $b would expand to 5, but without the dollar, it's just the word 'b'. Since 'b' is not a numeric value, this test is invalid or evaluates to false. Therefore this option is not true.

Option 3: [ $a –eq 10 –a $b –gt 5 ]
- This combines two tests with -a (logical AND). The first test $a -eq 10 checks whether 10 equals 10, which is true. The second test $b -gt 5 checks whether 5 is greater than 5, which is false. Since one side is false, the entire conjunction is false. So this option is not true.

Option 4: [ $a –le 10 ]
- This tests whether the value of a (10) is less than or equal to 10. Since 10 <= 10 is true, this condition evaluates to true. This is the correctly true option, given a=10.

Summary of which options are true or false: Option 1 is invalid/false as written due to improper arithmetic syntax and formatting. Option 2 is false because it references the literal 'b' instead of the variable. Option 3 is false because the second condition fails (5 is not greater than 5). Option 4 is true because 10 is indeed less than or equal to 10.

Given the following shell variable assignments, a=10; b=5; c=3 Which of the following conditions is true?单项选择题

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