Why should you always enclose your `grep` search pattern in single quotes? (e.g. `grep -v '\?*' file` as opposed to `grep -v \?* file`) They are required by `grep`. Some shell metacharacters are also regular expression characters, so `grep` could get confused when interpreting the command string. Quoting them makes `grep` ignore them and pass the literal characters to `bash`. Some regular expression characters are also shell metacharacters and `bash` could get confused when interpreting the command string. Quoting them makes `bash` ignore them and pass the literal characters to `grep` They are required by `bash`.

The `grep` command is used to search for patterns in files. It searches through a file or set of…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Why should you always enclose your `grep` search pattern in single quotes? (e.g. `grep -v '\?*' file` as opposed to `grep -v \?* file`)

		They are required by `grep`.
		Some shell metacharacters are also regular expression characters, so `grep` could get confused when interpreting the command string. Quoting them makes `grep` ignore them and pass the literal characters to `bash`.
		Some regular expression characters are also shell metacharacters and `bash` could get confused when interpreting the command string. Quoting them makes `bash` ignore them and pass the literal characters to `grep`
		They are required by `bash`.

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