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landing/docs/Bash-Scripts/007-bash-arguments.md

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+# Runtime Arguments
+
+Pass data into your script at execution. Arguments follow the script name:
+
+```bash
+./your_script.sh first_argument
+```
+
+Inside the script, `$1` references the first argument, `$2` the second, and so on.
+
+Let's see this in `arguments.sh`:
+
+```bash
+touch arguments.sh
+```
+
+Open `arguments.sh` and add:
+
+```bash
+#!/usr/bin/env bash
+
+echo "Arg 1: $1"
+echo "Arg 2: $2"
+echo "Arg 3: $3"
+```
+
+Save and exit. Make it executable:
+
+```bash
+chmod +x arguments.sh
+```
+
+Run with three arguments:
+
+```bash
+./arguments.sh dog cat bird
+```
+
+Output:
+
+```bash
+Arg 1: dog
+Arg 2: cat
+Arg 3: bird
+```
+
+To access *all* arguments, use `$@`. Update `arguments.sh`:
+
+```bash
+#!/usr/bin/env bash
+
+echo "All arguments: $@"
+```
+
+Save. Run again with arguments:
+
+```bash
+./arguments.sh dog cat bird
+```
+
+Output:
+
+```bash
+All arguments: dog cat bird
+```
+
+### Script Name (`$0`)
+
+`$0` references the script itself. This is useful for logging or unique operations.
+
+You can even use `$0` for self-deletion. **Handle with extreme caution!**
+
+Create `self_destruct.sh`:
+
+```bash
+touch self_destruct.sh
+```
+
+Open `self_destruct.sh` and add:
+
+```bash
+#!/usr/bin/env bash
+
+echo "This script: $0 is self-destructing."
+
+rm -f $0
+```
+
+Save and exit. Make it executable:
+
+```bash
+chmod +x self_destruct.sh
+```
+
+Run it:
+
+```bash
+./self_destruct.sh
+```
+
+The script will print its name, then delete itself. **This is irreversible. No second chances.** Always back up before testing self-deletion.