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How do I use single quotes in Linux?
Single quotes: Enclosing characters in single quotation marks (‘) holds onto the literal value of each character within the quotes. In simpler words, the shell will interpret the enclosed text within single quotes literally and will not interpolate anything including variables, backticks, certain \ escapes, etc.
What is quoting in Linux?
Quoting is used to remove the special meaning of certain characters or words to the shell. Quoting can be used to disable special treatment for special characters, to prevent reserved words from being recognized as such, and to prevent parameter expansion.
When to use single quotes in a shell?
As you can verify, each of the above lines is a single word to the shell. Quotes (single or double quotes, depending on the situation) don’t isolate words. They are only used to disable interpretation of various special characters, like whitespace, $, ; For a good tutorial on quoting see Mark Reed’s answer.
How to escape quotes in a POSIX shell?
In a POSIX shell, assuming in your string there is no variable, command or history expansion, and there is no newline, follow these basic prescriptions: Substitute any sequence of non-single-quote characters with the same sequence with added leading and trailing single quotes: ‘aaa’ ==> ”aaa”
When to use single quote or double quote in Linux?
Single Quote. Use single quote when you want to literally print everything inside the single quote. Even the special variables such as $HOSTNAME will be print as $HOSTNAME instead of printing the name of the Linux host. Double Quote. Use double quotes when you want to display the real meaning of special variables.
Can a single quote be in a single quotation?
Single-quotation marks are more draconian. Everything between them is taken completely literally, including backslashes. There is absolutely no way to get a literal single quote inside single quotes. Fortunately, quotation marks in the shell are not word delimiters; by themselves, they don’t terminate a word.