Simple commands (BASH)
At first, the easiest part, but not less important than other commands.
Files and directories management
filtering files
management for compressed files
replacing characters
filtering and processing data
Intermediated commands (BASH)
Commands assigned to users, groups and permissions.
Users
sudo
that command allows to users to execute commandlines as superuser (root).
useradd (create users)
usermod (modofy user info)
userdel (delete user)
Groups
sudo
groupadd
groupdel
groupmod
permissions
chmod
Simple
chmod command simple syntax :
- r (read): reading permission
- w (write): writing permission
- x (execution): execution permission
permissions apply to three entities: user (u), group (g), and others (o).
Octal
chmod command octal syntax are specified with octal characters:
4 Reading
2 Writing
1 Execution
permissions apply to three entities contemplating the number and its position (u g o): user (u), group (g), and others (o).