Triple input redirection symbol in bash script [duplicate]

Question

I saw a code like this that could be run on the bash prompt: bc fibonacci.bc <<< "fibonacci(1)" A function fibonacci(n)is defined in the file fibonacci.bc. The syntax of the function follows bc syntax rules. The redirection symbol <<< looks new to me. Can somebody throw some light on it?

Reading your question, I think you may be interested by reading This answer to Is bash a programming language? — F. Hauri - Give Up GitHub
– F. Hauri - Give Up GitHub, Commented Mar 14, 2024 at 7:52
Do a man bash and search for <<<. The first hit will be a small section titled Here Strings which explains everything about this operator. — user1934428
– user1934428, Commented Mar 14, 2024 at 8:07

jeremy-denis · Accepted Answer · 2024-03-14 09:06:38Z

2

The <<< symbol is used to pass a string as the standard input of the command used.

It's called a here-string.

The simplest example is with cat:

cat <<< 'hello'

You can find a first explanation in the man bash page https://www.gnu.org/software/bash/manual/html_node/Redirections.html#Here-Strings

edited Mar 14, 2024 at 9:06

answered Mar 14, 2024 at 7:52

jeremy-denis

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4 Comments

tripleee Over a year ago

I would generally be hesitant to link to the ABS.

jeremy-denis Over a year ago

ok i edit the link by link to online bash man page

tripleee Over a year ago

gnu.org/s/bash/manual might be a better link, it has HTML sections you can link to.

jeremy-denis Over a year ago

thank you for your feedback i edit the link with gnu.org/software/bash/manual/html_node/…

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