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chmod 权限计算器.
在八进制（755）与符号形式（rwxr-xr-x）之间转换 Unix 文件权限，支持 setuid、setgid 和粘滞位，并给出权限表和 chmod 命令。
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使用方法: chmod 权限计算器
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
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英语技术说明
Standard Unix permission bits only; ACLs and SELinux labels are not covered. Everything is calculated in your browser; nothing you type is uploaded.
Each class (owner, group, others) adds read = 4, write = 2 and execute = 1. A fourth leading digit sets setuid (4), setgid (2) and the sticky bit (1), shown as s, s and t in the symbolic form.
755 is rwxr-xr-x: the owner can read, write and run the file; group and others can read and run it. 1777 adds the sticky bit (rwxrwxrwt).