Write File (Append): >>

Writes stdin to disk - appending contents if file already exists

Description

This is used to redirect the stdout of a command and append it to a file. If that file does not exist, then the file is created.

This behaves similarly to the Bash (et al) token except it doesn’t support adding alternative file descriptor numbers. Instead you will need to use named pipes to achieve the same effect in Murex.

Examples

» out "Hello" >> example.txt
» out "World!" >> example.txt
» open example.txt
Hello
World!

Detail

Syntactic Sugar

This is just syntactic sugar for -> >>. Thus when the parser reads code like the following:

out "foobar" >> example.txt

it will compile an abstract syntax tree which would reflect the following code instead:

out "foobar" | >> example.txt

Truncating A File

To truncate a file (ie overwrite its contents) use |> instead.

Synonyms

See Also


This document was generated from builtins/core/io/write_doc.yaml.

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Last built on Tue Nov 10 18:11:59 UTC 2026 against commit 7547c407547c4045d7ae61ca6f41f9080b9469f4eceb252.

Current version is 7.4.2002 (unknown) which has been verified against tests cases.