Discussion
Which of the following is NOT an input/output redirection symbol that Linux shell assigns?
Answer: D
The exclamation mark (!) is not an input/output redirection symbol. In the Linux shell the symbol < redirects standard input from a file, > redirects standard output to a file overwriting it, and >> appends the output to a file. The '!' is used for history expansion and for negation, not for redirecting input or output. For example, command > file.txt sends the output to a file, command < file.txt takes input from it, and command >> file.txt adds to it.
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