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-> Arrow Pipe

Pipes stdout from the left hand command to stdin of the right hand command

Description

This token behaves much like pipe would in Bash or similar shells. It passes stdout along the pipeline while merging stderr stream with the parents stderr stream.

-> differs from | in the interactive terminal where it produces different autocompletion suggestion. It returns a list of “methods”. That is, commands that are known to support the output type of the previous command. -> helps with the discovery of command line tools.

In shell scripts, -> and | can be used interchangeably.

Examples

Piping stdout

» out Hello, world! -> regexp s/world/Earth/
Hello, Earth!

» out Hello, world!->regexp s/world/Earth/
Hello, Earth!

Piping stderr

In following example the first command is writing to stderr rather than stdout so Hello, world! doesn’t get pipelined and thus isn’t affected by regexp:

» err Hello, world! -> regexp s/world/Earth/
Hello, world!

To pipe stderr you’d need to use the <!> syntax. For example <!out> to write stderr to stdout:

» err <!out> Hello, world! -> regexp s/world/Earth/
Hello, Earth!

See Also

• Pipeline: Overview of what a “pipeline” is
• <pipe> Read Named Pipe: Reads from a Murex named pipe
• => Generic Pipe: Pipes a reformatted stdout stream from the left hand command to stdin of the right hand command
• ? stderr Pipe: Pipes stderr from the left hand command to stdin of the right hand command (DEPRECATED)
• err: Print a line to the stderr
• out: Print a string to the stdout with a trailing new line character
• regexp: Regexp tools for arrays / lists of strings
• | POSIX Pipe: Pipes stdout from the left hand command to stdin of the right hand command

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This document was generated from gen/parser/pipes_doc.yaml.