unit 2 linux

chmod

chown

chexeute

chfile

adduser

useadd

usermod

adddir

environment

env

envprint

envm

show

print

echo

view

chmod u+r [filename]

chmod u-r [filename]

chmod u=r [filename]

chmod u*r [filename]

groupadd

addgroup

newgroup

create-group

sudo usermod -uG groupname username

sudo usermod -aG groupname username

sudo usermod -G groupname username

sudo usermod -dG groupname username

ls -h

ls -a

ls

ls -r

Allows only the owner to read and write

Gives read, write, and execute permissions to everyone

Allows the owner to read, write, and execute; others can read and execute

Removes all permissions

Displays system-wide logs

Points to the root directory

Represents the user’s home directory

Shows all active processes