Mask Bash scripts in the browser
Select functions, identifiers, values, and comments to create a shareable Copy that preserves Bash structure. The input Source is not sent to or stored on the Develop Tools server.
Open Bash Script Masking ToolConclusion
Mask input content in the browser and create a shareable copy that checks not only secrets but also destinations, identifiers, and comments.
Do not edit the original Script directly; work on a shareable Copy.
Why Bash must not be replaced as a mere string
Bash semantics are determined by quotes, parameter expansion, command substitution, pipelines, redirects, and more. If you remove structure needed to investigate the cause, the recipient cannot reproduce the problem.
#!/usr/bin/env bash
API_URL="https://api.internal.example/v1"
API_TOKEN="prod-token-123"
curl -H "Authorization: Bearer ${API_TOKEN}" "${API_URL}/users"#!/usr/bin/env bash
VARIABLE001="msg001"
VARIABLE002="msg002"
curl -H "msg003 ${VARIABLE002}" "${VARIABLE001}/msg004"Steps to check with the Bash script masking tool
- 1. Duplicate the original script and paste it into the input field without executing it.
- 2. Select the functions, identifiers, values, and comments to process.
- 3. Run masking and compare the structures on the left and right.
- 4. Right-click and restore only the necessary parts of the result individually.
- 5. After secret searches and syntax checks, share only the result.
Checklist to prevent oversights
| Category | Account to check |
|---|---|
| Credential | Token, Password, private key, Cookie |
| Connection destination | URL, IP, Host, Port, DB name |
| Operational information | Path, User, Customer name, and Ticket number |
| Shell structure | Quote, expansion, Pipeline, and Redirect |
How to think about examples
Hide API URLs and token values while retaining variable expansion and curl argument structure. Even if AI has no execution permission, check that no destructive commands are present.
Checklist to review before sharing
- Search for remaining API keys, tokens, passwords, cookies, and private-key fragments.
- Check internal URLs, IP addresses, host names, ports, user names, and file paths
- Check whether comments, echo, error messages, and set -x traces also contain business information
- Compare whether the forms of Quote, ${...}, $(), Pipeline, Redirect, and Here Document are preserved.
- Share only the masking results, and retain the original script in an access-controlled location
- Do not rely only on masking credentials that have already been published; revoke and reissue them immediately
Destructive operations such as rm, dd, mkfs, DROP, and Production connections retain execution Risk even when values are hidden. Do not directly paste suggestions from AI or third parties into production.
What the Bash script masking tool can and cannot do
| Item | Current support | Additional information |
|---|---|---|
| Input | Pasting Bash code | Do not directly load or execute .sh files. |
| Target | Functions, identifiers, strings/numbers, and comments | Allow ON/OFF switching for each target type |
| syntax | Consider Shebang, Quote, expansion, control structures, Here Documents, and similar syntax. | Not a complete parser equivalent to Bash itself |
| Check results | Color coding, synchronized left-right scrolling, and individually re-enable right-click | After removal, recheck whether the values are safe to share |
| output | Copy to the clipboard | Does not execute Scripts, fix syntax, or revoke secrets. |
| Privacy | Process input and results in the browser. | Do not send or save Source Code to the Develop Tools Server. |
This Tool is masking assistance for creating a shareable Copy. It does not replace ShellCheck, bash -n, testing in the actual environment, or revocation and reissuance of leaked Credentials.
Check with official documentation and static analysis
- GNU Bash Reference Manual
- GNU Bash Manual: Quoting
- GNU Bash Manual: Shell Parameter Expansion
- GNU Bash Manual: Redirections
- ShellCheck official website
- POSIX Shell Command Language
Check Bash expansion order and quote semantics against the GNU Bash Manual as the primary source. For portable shell scripts, also use the POSIX specification and ShellCheck for common problems, and validate with the Bash version and execution environment in use.
Example: paste a deployment script containing curl into AI
Hide API URLs and token values while retaining variable expansion and curl argument structure. Even if AI has no execution permission, check that no destructive commands are present.
Masking results are not proof that syntax analysis or security diagnostics have passed. Before sharing, compare with the original script and check that no unnecessary information remains.
- Extract the minimal reproducible part
- Mask values, identifiers, and Comments
- Check the Bash structure and diagnostic information
- Share only the result
If a Secret may have been exposed even once, revoke that value and replace it with a new Credential.
Frequently asked questions
- Can Bash syntax errors also be fixed automatically?
- It cannot be fixed. The Tool masks content for sharing. Also use bash -n, ShellCheck, and Tests in the target environment.
- Can an API key be detected automatically?
- Values and similar items can be masked, but this is not a Scanner that semantically analyzes and guarantees every Secret format. Review the result visually.
- Is the entered Script sent to the Server?
- The Source and processing results are handled in the Browser and are not sent to or stored on the Develop Tools Server.