Why are the backslash and semicolon required with the find command’s -exec option?

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The backslash before the semicolon is used, because ; is one of list operators (or &&, ||) for separating shell commands. In example:

command1; command2

The find utility is using ; or + to terminate the shell commands invoked by -exec.

So to avoid special shell characters from interpretation, they need to be escaped with a backslash to remove any special meaning for the next character read and for line continuation.

Therefore the following example syntax is allowed for find command:

find . -exec echo {} \;
find . -exec echo {} ';'
find . -exec echo {} ";"
find . -exec echo {} \+
find . -exec echo {} +

See also:

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