The command to list a hierarchy of directories is
a: ls -R directory -name
b: ls -a directory -name
c: ls -all directory -name
d: ls -hierarchy directory -name
e: ls directory –name all
a: ls -R directory -name
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Why was the name of the database language changed from Structured English Query Language (SEQUEL) to Structured Query Language (SQL)?
a. It was easier to pronounce. b. Someone had already used the acronym SEQUEL. c. To gain international recognition. d. To differentiate it from earlier database languages.
The following conditional expression is written in the C language. It is false when variable a is assigned either 10 or 20 and true otherwise.
!(a = = 10 a = = 20) Which of the following conditional expressions is equivalent? a) a != 10 II b !=20 b) a<=1011b>=20 c) a< 101Ia> 20 d) a = = 10 && a = = 20 e) a != 10 && a != 20 f) !(a = = 10) && !(a = = 20)