Because the regexp is delimited by slashes, you need to escape any slash that is part of the pattern, in order to tell awk to keep processing the rest of the regexp. For example, the following sed command emphasizes every word: Below is the init container I am using, I need to use sed to modify on the fly one parameter, when I run kubectl create -f container.yaml I see this error: kubectl create -f tgtd-pod-v2.yaml unable to decode "tgtd-pod-v2.yaml": invalid character '(' in string escape code. If the expression starts with a backslash, the next character is the delimiter. In computer programming, leaning toothpick syndrome (LTS) is the situation in which a quoted expression becomes unreadable because it contains a large number of escape characters, usually backslashes ("\"), to avoid delimiter collision.. Though you still need to escape the '\' to stop sed misinterpreting it, you won't need to escape … You need two \\ because \ is an escape character. If you want to edit the file, add -i: sed -i 's/ / \\ /' hw The command replaces the space by space\space. … The same command run in shell works without any errors. If you need to use sed because you're doing something more complex than that, then a little known tip is that you can actually use other delimiters to make it more readable. means newline \r. For instance, to do this replacement correctly I should escape the second path: The vertical bars indicate boolean operations, whereas the backward slash is used to escape the vertical bars. Special meanings of certain escaped characters. In this particular case, the Apache configuration file has lines with #’s not at the beginning of some lines, ... Another use of sed consists in printing the lines from a file that match a given regular expression. \" A literal double quote (should be used for string constants only). Why do we care about the escaping backslash in JSON? With certain commands and utilities, such as echo and sed, escaping a character may have the opposite effect - it can toggle on a special meaning for that character. Because when you’re writing a JSON string, if there’s a backslash in the string, you have to escape it by prefixing with another backslash. To use a comma instead of a slash, use: sed '\,^#, s/[0-9][0-9]*//' The main advantage of this feature is searching for slashes. Sed does provide a few extra options when specifying regular expressions. But I'll discuss those later. means return \t. Linux Bash->SED compatible online escape character tool v.1.3. Put into Input Box the character sequence you want to escape: Input: Output: ESCPAE. I was editing a file and found accidentally that I somehow escaped all the forward slashes in a path I was replacing in text. If you have a file named hw containing Hello World, the sed command would be: sed 's/ / \\ /' hw This displays the wanted result on the screen. 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