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Learning basic command

Learning basic command. Understanding file permission. Why Are File Permissions Important ? Keep users from accessing other users’ private files To protect important system files. Understanding file permission. permissions bits : rwx rwx rwx Owner’s| Group | Others

paul-mcintyre
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Learning basic command

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  1. Learning basic command

  2. Understanding file permission Why Are File Permissions Important ? • Keep users from accessing other users’ private files • To protect important system files

  3. Understanding file permission permissions bits: rwx rwxrwx Owner’s| Group | Others r = read w = write x = execute For Files: "Read" means to be able to open and view the file "Write" means to overwrite or modify the file "eXecute" means to run the file as a binary files are executable only if they are programs and shell scripts, not useful for data files. For Directories: "Read" means to be able to view the contents of the directory "Write" means to be able to create new files/directories or delete files/directories within the directory "eXecute" means to be able to "Change Directory" (cd) into the directory = permission to access the directory.

  4. Understanding file permission How to view the permission for a file or directory? $ ls–al Default permission for an new file : rw:by the owner of the file. r: by group members and others. rw- r-- r— Default permission for an new directory: rwx:by the owner of the directory . rx:by group members and others. rwx r-x r-x

  5. Understanding file permission Only the owner of a file can change its permission. How to set file permission? Use the command chmod(change file mode bits). chmod has two notations: • Numeric (Octal) Notation. • Symbolic Notation

  6. Understanding file permission 1. Add single permission to a file/directory $ chmod u+x filename 2. Add multiple permission to a file/directory $ chmod u+r,g+x filename 3. Remove permission from a file/directory . $ chmod u-rx filename 4. Change permission for all roles on a file/directory $ chmod a+x filename

  7. Evaluation 1 - Create new directory 2-Change directory Permissions using Numeric Notation. Owner >> read , write , execute Group >>read , write Other >> read 3-Create new file inside the directory 4- Change file Permissions using Symbolic Notation All (Owner+group+other)>> read 5-view the permission for a file and directory

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