Why when using parenthesis with the egrep command in terminal I get the error: -bash: syntax error n-CodePudding

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Why when using parenthesis with the egrep command in terminal I get the error: -bash: syntax error n

Time：01-27

for example when typing the following command in terminal

egrep (cs)*449 hi.txt

gives the result

-bash: syntax error near unexpected token `cs'

CodePudding user response：

Maybe you can add double quote like this:

egrep "(cs)*449" hi.txt

I hope it's help for you