Stderr Checking In Pipes (trypipeerr)

Checks state of each function in a pipeline and exits block on error

Description

trypipeerr checks the state of each function and exits the block if any of them fail. Where trypipeerr differs from regular tryerr blocks is trypipeerr will check every process along the pipeline as well as the terminating function (which tryerr only validates against). The downside to this is that piped functions can no longer run in parallel.

Usage

trypipeerr { code-block } -> <stdout>

<stdin> -> trypipeerr { -> code-block } -> <stdout>

Examples

trypipeerr {
    out "Hello, World!" -> grep: "non-existent string" -> cat
    out "This command will be ignored"
}

Formated pager (less) where the pager isn’t called if the formatter (pretty) fails (eg input isn’t valid JSON):

func pless {
    -> trypipeerr { -> pretty -> less }
}

Detail

A failure is determined by:

You can see which run mode your functions are executing under via the fid-list command.

See Also


This document was generated from builtins/core/structs/tryerr_doc.yaml.

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Last built on Wed Jul 2 22:12:32 UTC 2025 against commit bb72b6fbb72b6fdd502f835172d7d06207ba4ec2c70886c.

Current version is 7.0.2107 (develop) which has been verified against tests cases.