Linux · Permissions interview questions

1. A.add execute permission for all on a file
2. B.set a mask producing private (700/600) new files
3. C.set permissions to rw-r--r-- (owner read/write, others read)
4. D.grant user alice read/write via a POSIX ACL

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1. A.umask 077
2. B.setfacl -m u:alice:rw file
3. C.chmod 644
4. D.getfacl file

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1. A.chmod 644 — display the POSIX ACL of a file
2. B.chmod 644 — set permissions to rw-r--r-- (owner read/write, others read)
3. C.chmod 644 — change the owner and group of a file
4. D.chmod 644 — grant user alice read/write via a POSIX ACL

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1. A.grant user alice read/write via a POSIX ACL
2. B.set a mask producing private (700/600) new files
3. C.set permissions to rwxr-xr-x (owner all, others read/execute)
4. D.set permissions to rw------- (owner read/write only)

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1. A.setfacl -m u:alice:rw file
2. B.chown user:group file
3. C.chmod 755
4. D.chmod g+s dir

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1. A.chmod 755 — set a mask producing private (700/600) new files
2. B.chmod 755 — change the owner and group of a file
3. C.chmod 755 — grant user alice read/write via a POSIX ACL
4. D.chmod 755 — set permissions to rwxr-xr-x (owner all, others read/execute)

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1. A.set permissions to rw------- (owner read/write only)
2. B.set SGID so new files inherit the directory's group
3. C.set permissions to rwxr-xr-x (owner all, others read/execute)
4. D.add execute permission for all on a file

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1. A.chmod 600
2. B.chmod 755
3. C.chmod 700 dir
4. D.chown user:group file

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1. A.chmod 600 — set permissions to rw-r--r-- (owner read/write, others read)
2. B.chmod 600 — grant user alice read/write via a POSIX ACL
3. C.chmod 600 — set permissions to rw------- (owner read/write only)
4. D.chmod 600 — set permissions to rwxr-xr-x (owner all, others read/execute)

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1. A.display a user's password-aging information
2. B.change the owner and group of a file
3. C.display the POSIX ACL of a file
4. D.set permissions to rw-r--r-- (owner read/write, others read)

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1. A.getfacl file
2. B.umask 077
3. C.chmod g+s dir
4. D.chown user:group file

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1. A.chown user:group file — change the owner and group of a file
2. B.chown user:group file — display the POSIX ACL of a file
3. C.chown user:group file — grant user alice read/write via a POSIX ACL
4. D.chown user:group file — display a user's password-aging information

Answer + AI explanation with Pro

1. A.set permissions to rw------- (owner read/write only)
2. B.grant user alice read/write via a POSIX ACL
3. C.add execute permission for all on a file
4. D.display the POSIX ACL of a file

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1. A.chmod 600
2. B.chmod +x file
3. C.setfacl -m u:alice:rw file
4. D.chmod 644

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1. A.setfacl -m u:alice:rw file — grant user alice read/write via a POSIX ACL
2. B.setfacl -m u:alice:rw file — set permissions to rwxr-xr-x (owner all, others read/execute)
3. C.setfacl -m u:alice:rw file — add execute permission for all on a file
4. D.setfacl -m u:alice:rw file — set permissions to rw------- (owner read/write only)

Answer + AI explanation with Pro

1. A.add execute permission for all on a file
2. B.set permissions to rw-r--r-- (owner read/write, others read)
3. C.display a user's password-aging information
4. D.set permissions to rwx------ (owner only)

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1. A.chmod 644
2. B.chage -l user
3. C.getfacl file
4. D.chmod 600

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1. A.chage -l user — set permissions to rw------- (owner read/write only)
2. B.chage -l user — change the owner and group of a file
3. C.chage -l user — set permissions to rwxr-xr-x (owner all, others read/execute)
4. D.chage -l user — display a user's password-aging information

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1. A.permissions rwxrwxrwx — full access for everyone (risky)
2. B.a permission so only a file's owner (not others) can delete it
3. C.the file storing user account entries (name, UID, shell, home)
4. D.a mask producing new files as 644 and new directories as 755

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1. A.SGID bit
2. B.capabilities (setcap)
3. C./etc/passwd
4. D.SUID bit

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1. A./etc/passwd — a permission that runs an executable with the file owner's privileges
2. B./etc/passwd — the file storing user account entries (name, UID, shell, home)
3. C./etc/passwd — a mask producing new files as 644 and new directories as 755
4. D./etc/passwd — the file storing hashed user passwords and aging data

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1. A.the file storing hashed user passwords and aging data
2. B.a permission that runs an executable with the file group's privileges
3. C.permissions rwxrwxrwx — full access for everyone (risky)
4. D.the file storing user account entries (name, UID, shell, home)

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1. A./etc/passwd
2. B.SUID bit
3. C./etc/shadow
4. D.chmod 777

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1. A./etc/shadow — a permission so only a file's owner (not others) can delete it
2. B./etc/shadow — the file storing user account entries (name, UID, shell, home)
3. C./etc/shadow — permissions rwxrwxrwx — full access for everyone (risky)
4. D./etc/shadow — the file storing hashed user passwords and aging data

Answer + AI explanation with Pro

1. A.a permission that runs an executable with the file owner's privileges
2. B.permissions rwxrwxrwx — full access for everyone (risky)
3. C.a mask producing new files as 644 and new directories as 755
4. D.fine-grained root powers granted to a binary instead of full SUID

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1. A./etc/shadow
2. B.SUID bit
3. C./etc/passwd
4. D.capabilities (setcap)

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1. A.SUID bit — a mask producing new files as 644 and new directories as 755
2. B.SUID bit — a permission that runs an executable with the file owner's privileges
3. C.SUID bit — the file storing user account entries (name, UID, shell, home)
4. D.SUID bit — a permission that runs an executable with the file group's privileges

Answer + AI explanation with Pro

1. A.a mask producing new files as 644 and new directories as 755
2. B.a permission so only a file's owner (not others) can delete it
3. C.a permission that runs an executable with the file owner's privileges
4. D.the file storing user account entries (name, UID, shell, home)

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1. A./etc/passwd
2. B.sticky bit on /tmp
3. C./etc/shadow
4. D.chmod 777

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1. A.sticky bit on /tmp — a permission so only a file's owner (not others) can delete it
2. B.sticky bit on /tmp — fine-grained root powers granted to a binary instead of full SUID
3. C.sticky bit on /tmp — a permission that runs an executable with the file group's privileges
4. D.sticky bit on /tmp — a permission that runs an executable with the file owner's privileges

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