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In shell scripting (for example, Unix C Shell or Bourne Shell programming), some characters have special meaning to the shell, and can't be gracefully employed in text strings without 'escaping' them (preceding them with a backslash (\) to prevent the shell from reading them as commands. There might be much dispute over which five it is to which this question refers.

These are the

*backslash (escape) \

*pipe (joins two commands) |

*dollar sign (specifies a variable) $

ampersand ('and' sign, joins commands) &

exclamation point (wildcard) !

asterisk (wildcard) *

*pound sign (comment only - do not run) #

*semicolon (begin new line/command) ;

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