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?

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