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A coding agent can help merge several old Bash scripts into one command-line tool, but the result is only as trustworthy as your inventory of the originals and your review of what the agent changes. The workflow below covers the steps that matter: documenting each script, giving the agent a bounded brief, limiting what it can touch, and checking its output before you rely on it.
Start with an inventory, not a prompt
Most consolidation problems come from behavior nobody wrote down. Before you open an agent, list every script you want to fold in and answer the same questions for each one. A simple table keeps the answers comparable:
| Question | Why it matters |
|---|---|
| What arguments does it take, and in what order? | Positional arguments are the contract callers depend on. |
| What does it print, and what exit status does it return? | Scripts often signal success or failure only through their exit code. |
| What does it create, move, overwrite, or delete? | Side effects are where a merge can cause real damage. |
| What does it assume about the environment? | Hard-coded paths, installed commands, and the shell version all travel with the code. |
| Which behaviors do you actually rely on? | Anything you do not list may be silently dropped. |
Write the answers in plain text next to each script. This inventory becomes the specification the agent works from and the checklist you review against.
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Understand what a Bash script gives you to work with
The GNU Bash Reference Manual, Edition 5.3, defines a shell script as a text file containing shell commands. Arguments supplied when the script runs reach it through positional parameters such as $1, $2, and $@, and the file needs executable permission and, usually, an interpreter line to run directly. Those are the mechanics any merge has to preserve. Read the manual’s sections on positional parameters and script execution at https://www.gnu.org/s/bash/manual/bash.html if you want the exact rules for your Bash version.
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A common way to combine several scripts is a dispatcher: the first argument selects a subcommand, and the remaining arguments pass through to the original logic. The skeleton below is illustrative only and is not based on any particular script:
#!/usr/bin/env bash
set -u
usage() {
echo "usage: mytool {backup|sync|clean} [args]" >&2
}
cmd="${1:-}"
[ "$#" -gt 0 ] && shift
case "$cmd" in
backup) backup_main "$@" ;;
sync) sync_main "$@" ;;
clean) clean_main "$@" ;;
*) usage; exit 2 ;;
esacThe design choice that matters here is that each original script becomes a function that keeps its own argument handling. Rewriting everything into one shared parser is where behavior drifts, so keep the old logic intact until you have tested it.
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Write a brief the agent can be held to
Vague requests produce vague merges. A useful brief is specific enough that you can check the result against it:
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors- Name each source script and the subcommand it should become.
- State that existing arguments, output text, and exit codes must stay the same unless you list an exception.
- Forbid new destructive operations, and require that any deletion or overwrite keep its original path logic.
- Ask for one logical change per step, so each step can be reviewed on its own.
- Require a short note listing any behavior the agent could not preserve, instead of silently choosing one.
Decide what the agent is allowed to touch
Coding agents differ in what they can do. Some can run shell commands, edit files, and install packages, and each capability is governed by the product and its configuration. Anthropic’s Claude Code CLI reference at https://docs.anthropic.com/en/docs/claude-code/cli-usage documents controls such as a disallowed-tools setting, a permission mode option, and a flag that skips permission prompts, which the documentation describes as something to use with caution. Those are examples from one product. Check the documentation for whichever agent you use.
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- Used Book in Good Condition
Practical limits that apply regardless of product:
- Work in a version-controlled copy or a dedicated branch so every agent change is a diff you can revert.
- Keep your original scripts untouched until the new tool passes your checks.
- Avoid permission-bypass modes in any directory that holds your only copy of data.
- Restrict the agent from running commands that touch paths outside your test directory.
Review the change as if a stranger wrote it
Treat the agent’s output the way you would treat a pull request from a contributor who has never seen your machine. Work through it in this order:
- Map every old behavior. Open each original script beside the new function that replaces it, and confirm that each argument, output line, and exit code has a counterpart.
- Check syntax. Run
bash -n mytoolto parse the file without executing it. This catches syntax errors only, not logic errors. - Read every quoting decision. Unquoted variables are the most common source of breakage when filenames contain spaces or glob characters.
- Trace destructive commands. Find every
rm,mv, redirection that overwrites, and any command run with elevated privileges, and confirm each one targets the same paths as before. - Run both versions on the same inputs. Compare the old script’s output and exit code with the new subcommand’s, in a scratch directory.
- Check any unusual input you actually use. Filenames with spaces, leading dashes, or non-ASCII characters are the usual failures.
Cases worth testing before you trust the tool
- No arguments, and an unknown subcommand, both produce usage text and a non-zero exit status.
- Missing or nonexistent input paths fail with a clear message rather than acting on the wrong directory.
- Running the same subcommand twice gives the same result, or the difference is documented.
- Paths containing spaces, quotes, or a leading hyphen are handled as single arguments.
- Any command that deletes or overwrites runs first in a scratch directory with known contents.
Record which of these you ran and what happened. A list of checks you did not run is just as useful to a reader as a list of passes.
Know when one Bash file is the wrong home
Google’s Shell Style Guide says shell “should only be used for small utilities or simple wrapper scripts.” It also advises that a script over 100 lines long, or one with non-straightforward control flow, should be rewritten in a more structured language. That is Google’s guidance for its own projects, not a universal rule, but it is a useful signal. If your merged tool needs its own parsing of options, nested state, or substantial data handling, the consolidation may be better served by a language with real data structures. The guide is at https://google.github.io/styleguide/shellguide.html.
What to write down for your own record
- The agent name and version you used, and the date.
- Each original script, its purpose, and the behaviors the new tool keeps, changes, or drops.
- Which agent proposals you accepted, edited, or rejected.
- The checks you ran, in the environment where you ran them.
- The platform assumptions the tool still carries, such as the Bash version and required commands.
Keeping this short record turns the merge from a one-time event into something you can maintain, and it tells the next person, including future you, what the tool was built to do.
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