![]() ![]() Finally, we compare the normal and escaped version to determine whether we need to escape this character and output the result if we do. After that, with the help of the %q format modifier, we get an escaped version of the character. Next, this value is reused in printf with a prefix to get the resulting character. For each, it uses printf to extract and compare each character with its escaped form.įirst, %o returns the octal form of the character’s code. The snippet above goes through the first 128 characters in the ASCII table. The characters we would need to escape in that instance are in the output of the following script: $ for code in " An ANSI escape sequence is a sequence of ASCII characters the first two are the escape character (1Bh) and the left bracket character (5Bh). Recall our discussion of writing strings without quotes. The standard built-in printf (Print Function) command also has its own special character. ![]() Let’s now explore how Bash treats sequences without any quotes. This simply means that we can spread a string over several lines without adding newline characters to it: $ text="a \ disabling history expansion via set +o histexpandįinally, the combination is ignored and removed from double-quoted strings.enclosing it in single quotes to escape an.using it at the end of a string or before whitespace characters.prefixing it with a backslash (which remains, same as with a normal character like ).Importantly, the is an exceptional character, the special meaning of which can be ignored by: ~, when beginning a string, to avoid tilde expansion and confusion with the $HOME directoryįurthermore, the prefix is not stored in the string when preceding all but one () of the characters above: $ text="!event".!, when history expansion is enabled outside POSIX mode, usually the case.\, when prefixing a character in this list except.newline, which is equivalent to under Linux.”, when we need a double quote within double quotes.`, also known as the backquote operator.These are all special characters, which may have to be escaped to preserve their literal meaning within double quotes:
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