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combined-head-linecount-check

Verify a file's first N lines and total line count in one shell call using head and wc -l with an echo separator, minimizing read operations and shell iterations.

examples/my-daily-monitor/skills/combined-head-linecount-check/SKILL.md

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# Combined Head + Line Count Check

When you need to **both** inspect the top of a file and confirm its total line count, collapse the two checks into a single `run_shell` call instead of issuing two separate commands.

## Why

- Each shell call is a round-trip. Two separate calls (`head` then `wc -l`) cost two iterations.
- A combined call costs one iteration and returns both pieces of information atomically.
- When checking multiple files at once, each file still only needs one call (or all files can be parallelized in a single compound command).

## Pattern

```bash
head -N <file> && echo "---" && wc -l <file>