linux permissions chmod

[dev]

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-rw-rw-r--
drwxr-xr-x

First letter
- regular file
d directory
c character special file
l symbolic link

r - read
w - write
x - execute

x in directory means can list content.

chmod: change mode
chmod

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chmod 664 example.txt
chmod u=rw,g=rw,o=r example.txt
chmod a+rwx,u-x,g-x,o-wx example.txt