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Parameter Expansion Traps
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2026/3/9
- `${var:-default}` if unset OR empty — `${var-default}` only if unset - `${var:=default}` assigns — `${var:-default}` doesn't modify var - `${var:-$(cmd)}` runs command even if just checking — expansion happens - `${var: -3}` needs space — without space it's default value syntax - `${var:0:5}` counts bytes in some locales — not chars
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资源信息
- 数据来源
- bigquery-gharchive
- 分类
- uncategorized
- 创建时间
- 2026/3/9
- 更新时间
- 2026/3/14
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