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fix(cli): update replaces an ash in a read-only bin dir in place - #7
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When `ash` lived in a directory the user can't write (root-owned /usr/local/bin holding a user-owned ash, no passwordless sudo), install and `ash update` wrote a second copy to ~/.local/bin and left the old one first on PATH, so non-interactive shells kept running the stale CLI. - if the directory isn't writable but the ash file is, overwrite it in place - after installing elsewhere, warn when an earlier ash on PATH still shadows it - `ash update` exits right after the rewrite so bash doesn't keep reading the file it just replaced Found on a machine where the pre-rewrite CLI (no `update` command) sat in /usr/local/bin while the new one had been installed into ~/.local/bin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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问题
ash所在目录不可写（root 建的/usr/local/bin里放着本人的 ash、又没有免密 sudo）时，安装和ash update会在~/.local/bin另装一份，PATH 里更靠前的旧版本永远不会被替换，非交互 shell（ssh 命令、部分 Agent 工具）一直在跑旧 CLI。实际在 100.70.70.3 上遇到：/usr/local/bin里是重写前的老 CLI（没有update命令，只打印帮助），新 CLI 装在了~/.local/bin。修复
ash update改写完立即退出，bash 不会接着读被改写的脚本测试
npm run check：UI 29、server 58 全部通过🤖 Generated with Claude Code