Install trimal with Homebrew, Nix

Project links

• Homepage
• Repository

Commands and aliases

• readal
• statal
• trimal

Project history

The trimAl documentation describes the tool as software for automatically removing spurious sequences or poorly aligned regions from a multiple sequence alignment. It can select reliable positions using gap proportion, residue similarity, consistency across multiple alignments, or manual column and sequence selections.

The official documentation cites the 2009 Bioinformatics paper 'trimAl: a tool for automated alignment trimming in large-scale phylogenetic analyses' by Capella-Gutiérrez, Silla-Martínez, and Gabaldón, establishing the tool's origin in large-scale phylogenetics rather than general text processing.

Adoption history

trimAl's adoption came from computational biology workflows that needed a command-line way to standardize alignment trimming across many datasets. The documentation's examples and installation flow assume shell use, compiled binaries, and repeatable invocations over input/output alignment files.

Homebrew and Nix packaging matter because biology users often need the same tools on lab Macs, Linux workstations, and cluster login nodes. Packaging `trimal`, `readal`, and `statal` makes the workflow easier to reproduce without manual source builds.

How it is used

The basic pattern is `trimal -in <inputfile> -out <outputfile> -<trimming_method>`. The official usage page documents supported input formats such as clustal, fasta, nexus, phylip, and pir, plus output conversion, HTML reports, statistics, backtranslation, and automated methods including `-gappyout`, `-strict`, `-strictplus`, and `-automated1`.

The algorithm documentation separates manual column selection, threshold-based trimming, overlap trimming for incomplete sequences, and automated methods. This makes trimAl useful both for quick pipeline defaults and for explicit, paper-method-style parameter reporting.

Why package nerds care

For package nerds, trimAl is the kind of small scientific binary that keeps old-school Unix bioinformatics alive: it has named executables, stable flags, plain files in and out, and no service layer.

It is also historically relevant because its value is not novelty UI but repeatability. A package-manager install lets researchers pin a formula or derivation and rerun phylogenetic trimming methods consistently across datasets.

Timeline

• 2009: trimAl paper published in Bioinformatics for automated alignment trimming in large-scale phylogenetic analyses.
• Current docs: Version 1.5.1 binaries and source builds are documented for Linux, macOS, and Windows.
• Current docs: trimAl/readAl installation check uses example alignments from the dataset directory.
• Current docs: Usage documents manual, threshold, overlap, and automated trimming methods.

Related projects

• Related tools and concepts include readAl, statAl, multiple sequence alignment formats, phylogenetic tree reconstruction, gap/similarity/consistency scoring, and downstream maximum-likelihood or neighbor-joining workflows.

Sources

• https://trimal.readthedocs.io/
• https://trimal.readthedocs.io/en/latest/algorithms.html
• https://trimal.readthedocs.io/en/latest/installation.html
• https://trimal.readthedocs.io/en/latest/usage.html