Master Linux File Permissions And Chmod Patterns with 66 free flashcards. Study using spaced repetition and focus mode for effective learning in Devops.
Sample card
What does rwxr-xr-- mean?
Owner: rwx (7).
Group: r-x (5).
Other: r-- (4).
Octal: 754.
rwxr-xr-- mean?
Q · 1 of 66
What does rwxr-xr-- mean?
Q · 2 of 66
Convert 644 to symbolic.
Q · 3 of 66
Convert 755 to symbolic.
rwxr-xr-- mean?Owner: rwx (7).
Group: r-x (5).
Other: r-- (4).
Octal: 754.
rw-r--r-- — owner read+write, group read, others read.
rwxr-xr-x — typical for executables and directories.
rw------- — typical for private files like ~/.ssh/id_ed25519.
rwx------ — typical for ~/.ssh directory.
~/.ssh be 700?SSH refuses to use a key in a directory or with permissions that are group/world accessible — security check.
chmod u+x file do?Adds the execute bit for the file's owner only.
chmod g+s dir and chmod o+t dir?setgid on directory: new files inherit group of dir.
sticky bit: only owner can delete files in dir (like /tmp).
chmod u+s /usr/bin/passwd — runs as file owner (root) regardless of caller. Use with care.
4755.
find . -type d -exec chmod 755 {} \; -o -type f -exec chmod 644 {} \;
chown user:group path; add -R for recursive.
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