Given the following shell variable assignments,

a=6; b=10; c=15

Which of the following conditions is true?

Question

Given the following shell variable assignments,

a=6; b=10; c=15

Which of the following conditions is true?

BlackTom AI · Accepted Answer

We start by restating the setup and the answer choices clearly, using the given shell variable values: a=6, b=10, c=15.

Option 1: [ $a –le 6 ]
- In proper shell syntax this is [ $a -le 6 ]. With a=6, this tests whether 6 is less than or equal to 6, which is true. The test succeeds, so this option is valid.

Option 2: [ $b = ($c – 5) ]
- Here the expression uses ($c – 5) which is not a valid arithmetic or command substitution form inside [ ]. To perform arithmetic, you’d typically use the arithmetic expansion $((c-5)) and reference variables as $c. As written, this is a syntactic/semantic mismatch inside the test command, so it would not evaluate to true in a standard shell.

Option 3: [ $b –eq 10 –o a –gt 5 ]
- This option attempts a conditional using -eq 10 and -o for OR. While $b would expand to 10, the part after the OR is problematic: a is not expanded as a variable (it should be $a). Without the proper variable expansion, the expression becomes [ $b -eq 10 -o a -gt 5 ], and the a -gt 5 portion either fails parsing or treats a as a non-numeric string, breaking the numeric comparison. Even if the first part could be evaluated, the second part makes the whole expression unreliable; with correct syntax it could be true, but as written here it is not reliably true.

Option 4: [ c –ge 10 ]
- This tests the literal string c against 10, because the variable is not expanded (missing the $). Since c is not a number here, and certainly not the value 15, the comparison is invalid or false. The intended value would be $c (i.e., 15), which would be true for -ge 10, but in this exact form it is incorrect.

In summary, Option 1 is the only choice that aligns with correct shell syntax and the given values to yield a true result. The other options either misuse syntax, omit necessary variable expansion, or rely on invalid arithmetic methods inside the test command.

Given the following shell variable assignments, a=6; b=10; c=15 Which of the following conditions is true?单项选择题

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