问题2：本地文件系统挂载默认是共享的？ 问题3：文件系统访问控制是在哪一层实现的？ 二、文件系统权限管理 文件类型 文件权限 特殊权限(SUID, SGID, STICKY) 文件默认权限umask 用户&用户组 文件系统用户权限管理 对mode的管理 对ACL（Access Control Lists）的管理 ACL Access Entry保存在哪？ ACL的表示 内存中的ACL 是如何与具体的 permitted 文件默认权限umask 为什么默认创建的目录权限为755，文件为644？ 在linux系统中， ，这些新的文件或目录都会有默认的访问权限 创建一个新的文件或者目录时 umask命令与文件和目录的默认访问权限有关，umask值则表明了需要从默认权限中去掉哪些权限来成 为最终的默认权限值。 root@pubbeta2-curve5:~# umask 0022 权限为777，文件 权限为777，文件为666，经过与umask作用，最终权限为755、644 默认目录 Windows Linux umask /etc/login.defs # UMASK is the default umask value for pam_umask and is used by # useradd and newusers to set the mode of the new home directories

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get “permission “permission denied” errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place installing, set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: 1.8. Troubleshooting 53 conda Documentation, Release 4.6.0 umask 007 conda install umask 077 For more information

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get “permission “permission denied” errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place installing, set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: 1.8. Troubleshooting 53 conda Documentation, Release 4.6.1 umask 007 conda install umask 077 For more information

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 For more information on umask, see http://en.wikipedia.org/wiki/Umask. 1.7.5

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place having access: 1. Before installing, set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 102 Chapter 1. User guide conda Documentation

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 For more information on umask, see http://en.wikipedia.org/wiki/Umask. 4.1. User

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place having access: 1. Before installing, set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 102 Chapter 1. User guide conda, Release

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 For more information on umask, see http://en.wikipedia.org/wiki/Umask. 4.1. User

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 For more information on umask, see http://en.wikipedia.org/wiki/Umask. 4.1. User

during installation Cause The umask command determines the mask settings that control how file permissions are set for newly created files. If you have a very restrictive umask, such as 077, you get "permission "permission denied" errors. Solution Set a less restrictive umask before calling conda commands. Conda was intended as a user space tool, but often users need to use it in a global environment. One place set the umask to 007. 2. Install conda. 3. Return the umask to the original setting: umask 007 conda install umask 077 For more information on umask, see http://en.wikipedia.org/wiki/Umask. 4.1. User