A user profile is a visual display of personal data associated with a specific user, or a customized desktop environment. A profile refers therefore to the explicit digital representation of a person's identity. A user profile can also be considered as the computer representation of a user model.
/etc/profile - it contains system void variables, if you do any modification in this file it will effect to the administrator and local user profiles.
~/.bash_profile - it contains user specific variables, if you do any modification in this file it will effect to that particular account only.
/etc/bashrc - it contains system void alias variables
~/.bashrc - it contains user specific alias variables
.bash_history - it contains all executed commands history
Commands:
# alias - it will show the aliases
ailas Command Output |
# unalias <alias name> - it will remove mentioned alias
Note: you can always define an alias using /etc/bashrc OR .bashrc files
File Permissions:
Permission
|
Value
|
Number
|
Read
|
r
|
4
|
Write
|
w
|
2
|
Execute
|
x
|
1
|
Default permissions when you create a file or directory
File Permissions
| |
File
|
644
|
Directory
|
755
|
File and Directory Permissions |
In above image explained about file permissions
Commands to Change file/directory permissions
Symbolic permissions
u - user/owner
g - Group
o - Others
w - Write
x - Execute
+ - Allow
- - deny
# chmod [options] <mode/permissions> <file/directory> - to change permissions file/folder
Example: chmod 744 file1
# chmod u+rwx file or directory : in case of user only
# chmod ug+rwx file or directoty : in case of user and group
# chmod u+w,g+r,o+x directory/file
# chmod u+rw,g+rw directory/file
# chmod u-r, g-w,o-rw directory/file
# chmod ugo+rwx file/directory
# chmod ugo-rwx file/directory
# chown [options] <new owner> <file/directory> - to change ownership of file/folder
Example: chown user2 file1
chown user1:group1 file2
# chgrp [options] <new group> <file/directory> - to change group of file/folder
Example: chgrp gorup2 file2
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