Given the following shell variable assignments,

a=2; b=5; c=10

Which of the following conditions is true?

Question

Given the following shell variable assignments,

a=2; b=5; c=10

Which of the following conditions is true?

BlackTom AI · Accepted Answer

We start by restating the problem: we have shell variable assignments a=2, b=5, c=10, and we must determine which of the given test conditions is true.
Option 1: [ $a –eq 3 –o $b –ge 5 ]. If we substitute the variables, assuming correct shell syntax is [ $a -eq 3 -o $b -ge 5 ], this becomes [ 2 -eq 3 -o 5 -ge 5 ]. The left side 2 -eq 3 is false, while the right side 5 -ge 5 is true. An OR ( -o ) between false and true yields true. Therefore, this option evaluates as true (noting that the intended operators are dash-minus equivalents; the logic here is the key).
Option 2: [ a –eq 2 ]. Here the left side is the literal string a, not the variable $a, and the test operator -eq expects numeric values. Trying to compare the string 'a' to 2 results in an invalid numeric comparison in most shells, so this is not true in practice and would cause an error or false outcome depending on the shell's strictness. This makes the option unreliable and effectively incorrect for a numeric test.
Option 3: [ $c = (3 + 7) ]. This uses the string equality operator =. Substituting c=10 gives [ 10 = (3 + 7) ]. The right-hand side is the literal string '(3 + 7)' rather than the computed value 10, so the comparison 10 equals '(3 + 7)' is false. Hence this option does not hold.
Option 4: [ $b –gt 5 ]. Interpreting with the numeric operator -gt, and substituting b=5 yields [ 5 -gt 5 ]. Since 5 is not greater than 5, this evaluates to false. Therefore this option is not true.
In summary, Option 1 follows valid logical evaluation (true due to the right-hand side being true while the left is false, combined with OR), whereas Options 2, 3, and 4 fail due to improper variable usage, incorrect literal comparison, or strict numeric comparison that does not hold for the given values.

Given the following shell variable assignments, a=2; b=5; c=10 Which of the following conditions is true?单项选择题

类似问题

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

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

Which of the following shell scripts (if any) correctly prints TRUE if x and y are both equal to 10? Select all that apply.

The expression "if [ $count -gt 0 ]" checks if count is .....

Which of the following trees corresponds to a potential parse of the ambiguous sentence below, with correct syntactic categories? Some diagnostics are provided.

Which of the following sentences contain two non-finite verbs? Select all that apply.

Analyze the following sentence: The sentence contains [ Select ] 8 6 5 7 3 4 functional words, [ Select ] 2 3 1 4 5 count nouns, [ Select ] 4 5 2 1 3 mass nouns, and [ Select ] 1 5 2 3 4 adjectives.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单