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https://github.com/jbranchaud/til
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43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
# Merge A Sequence Of Lines Of Output
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More often than not when I'm chaining a sequence of Unix commands together, I'm
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eventually trying to fan them out or execute each argument separately. I
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recently had the need for a bunch of separate lines of output to be fanned back
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in to a single line.
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The tool I found for this job is `paste` (not the most intuitive name).
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> merge corresponding or subsequent lines of files
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I was listing out all the categories that my active [TIL posts](https://github.com/jbranchaud/til) full under. I used the following
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command to do that.
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```bash
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❯ git ls-files '*/*.md' | cut -d/ -f1 | sort -u
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ack
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ansible
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astro
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aws
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bash
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brew
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chrome
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...
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```
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Those are all my categories, but then the format I really wanted was for them to
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be all on the same line with a clear delimiter so that I could paste them for
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[use in another script](/llm/translate-to-canonical-tags-with-small-model.md).
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The trick is to tack on one more pipe to `paste`. The `-s` tells `paste` to join
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every line from a given input file (e.g. stdin) onto a single line. The `-d`
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allows for overriding the default delimiter (tab) with something like a `,`.
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Lastly, the trailing `-` tells `paste` to read from stdin rather than some other
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named file(s).
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```bash
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❯ git ls-files '*/*.md' | cut -d/ -f1 | sort -u | paste -sd, -
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ack,ansible,astro,aws,bash,brew,chrome,claude-code,clojure,css,cursor,deno,devops,docker,drizzle,elixir,gatsby,git,github,github-actions,go,groq,heroku,html,http,inngest,internet,java,javascript,jj,jq,kitty,linux,llm,mac,math,mise,mongodb,mysql,neovim,netlify,next-auth,nextjs,phoenix,planetscale,pnpm,postgres,prisma,python,rails,react,react_native,react-testing-library,reason,remix,rspec,ruby,sed,shell,sqlite,streaming,tailwind,taskfile,tmux,typescript,unix,vercel,vim,vscode,webpack,workflow,xstate,yaml,zed,zod,zsh
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```
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See `man paste` for more details.
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