Unix Pipe Builder

Build Unix command pipelines by chaining commands together.

Presets

Pipeline Commands

Generated Pipeline

cat file.txt
Pipeline:read file
cat

Examples

Count ERROR lines in a log

Input
1. cat — app.log
2. grep — ERROR
3. wc — -l
Output
cat app.log | grep ERROR | wc -l

The first preset reads the file, filters matching lines, and sends them to wc for a line count.

Extract unique client IPs

Input
1. cat — access.log
2. awk — {print $1}
3. sort
4. uniq
Output
cat access.log | awk {print $1} | sort | uniq

The builder concatenates the arguments exactly as entered; add shell quoting around the awk program before executing when required by your shell.

Build a JSON API filter

Input
1. curl — https://api.example.com/data
2. jq — .[] | select(.status == "active") | .name
Output
curl https://api.example.com/data | jq .[] | select(.status == "active") | .name

The output mirrors the component's raw concatenation. The jq expression contains pipes and needs correct shell quoting before execution.

About this tool

Unix Pipe Builder assembles a shell pipeline from ordered command and argument rows. Pick commands such as cat, grep, awk, sed, sort, uniq, wc, cut, head, tail, xargs, find, jq, or curl, and the tool joins each stage with the pipe operator while showing a plain-language description of recognized stages.

Five presets cover counting log errors, ranking requested URLs, finding large files, filtering a JSON API response, and extracting unique IP addresses. Rows can be added, removed, and edited, and the generated one-line pipeline can be copied directly.

The builder only concatenates text; it does not execute commands, validate flags, quote arguments, or model shell parsing. A pipe character typed inside an argument remains literal text in the generated string and may create additional shell stages when pasted into a terminal.

How to use

  1. Start from a preset or first command

    Load one of the five presets, or choose a command and enter its arguments in the initial row.

  2. Add pipeline stages

    Click Add Command for each transformation, then select the command and enter its flags, expressions, file names, or URL.

  3. Review the generated pipeline

    Read the exact shell string and the arrow-separated description. Reorder by rebuilding rows in the intended left-to-right data flow.

  4. Copy and verify before running

    Copy the pipeline, inspect quoting and untrusted values in a text editor, then run it only in the appropriate shell and environment.

Use cases

Sketch a log-analysis pipeline

Arrange file reading, pattern matching, sorting, deduplication, and counting stages before moving the command into a terminal or script.

Teach standard-stream composition

Show how each command's output becomes the next command's input and use the generated description to explain the flow.

Prototype JSON command chains

Combine curl and jq stages to draft an API-inspection command before adding production authentication and error handling.

Document an operational recipe

Build and copy a repeatable one-line command for a runbook, then review and test it in the target environment.

Common mistakes

Mistake:Assuming the generated pipeline has been executed or validated.

Fix:The tool only joins strings. Confirm that commands exist, flags are supported, files are correct, and the pipeline behaves as intended in a safe environment.

Mistake:Leaving awk, sed, jq, globs, or whitespace-containing arguments unquoted.

Fix:Add shell-appropriate quoting after copying so the shell passes each expression as the intended argument instead of interpreting it.

Mistake:Pasting untrusted input into an argument and running the result.

Fix:Do not execute generated shell text containing untrusted values. Validate inputs and use parameterized process APIs in applications.

Mistake:Using uniq without sorting when duplicates are not already adjacent.

Fix:Place sort before uniq unless the upstream data is guaranteed to group equal lines together.

Frequently asked questions

References & standards

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