How do you put quotes around variable bash?
Quoting Variables. When referencing a variable, it is generally advisable to enclose its name in double quotes. This prevents reinterpretation of all special characters within the quoted string — except $, ` (backquote), and \ (escape).
Should you quote variables in bash?
General rule: quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many.
What are quotes used for in bash?
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.
How do I print a quote in bash?
To print a double quote, enclose it within single quotes or escape it with the backslash character. Display a line of text containing a single quote. To print a single quote, enclose it within double quotes or use the ANSI-C Quoting .
What is $() in Bash?
$() means: “first evaluate this, and then evaluate the rest of the line”. Ex : echo $(pwd)/myFile.txt. will be interpreted as echo /my/path/myFile.txt.
What does a quote do in Bash?
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. Also relevant: Which characters need to be escaped in bash?
Does Bash accept quoting around VAR1?
Even though VAR1 is set to a numeric value, Bash will accept the ” quoting around VAR1 and correctly produce the outcome of the if statement using the is equal (i.e. -eq) comparison operation. Yet, we have not reached full circle yet, as the following still fails;
How do I use multiple quotes in the same argument?
If you can simply switch quotes, do so. If you prefer sticking with single quotes to avoid the additional escaping, you can instead mix and match quotes in the same argument: $ echo ‘single quoted. ‘”Double quoted.
What are single quotes used for in shell script?
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.