Q. POSIX identifies regular expressions as belonging to ____ categories.

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Q. grep command supports both extended and regular expressions.

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Q. Character class is used for matching a group of characters enclosed within a pair of _____

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Q. The following command will match ‘Agarwal’, ‘agarwal’ and ‘agrawal’.

$ grep “[aA]g[ar][ar]wal” emp.lst

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Q. Which of the following symbol is used for matching the immediate preceding character?

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Q. Which symbol is used for matching a single character?

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Q. Which of the following symbols are used for matching a pattern at specified locations?

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Q. The following command will match the lines beginning with ‘2’.

$ grep “^2” emp.lst

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Q. Which of the following symbols are a set of ERE (extended regular expressions) ?

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Q. Which option is used when we want to use an ERE with grep command?

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Q. Which of the following symbols are used for matching multiple patterns?

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Q. To perform context addressing, we have to enclose the pattern in ____

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Q. To select lines containing gupta and agarwal, which command will be used?

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Q. To write selected lines, ____ is used with sed.

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Q. Which built-in variable is used by the awk to specify the line numbers?

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Q. What is the default delimiter used by awk?

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Q. The printf function uses ___ for string data and ___ for numeric.

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Q. awk doesn’t use $ in evaluation or assignment of variables.

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Q. A user-defined variable is initialized to ____

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Q. awk uses ___ operator for concatenating strings.

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