mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
1.2 KiB
40 lines
1.2 KiB
2 years ago
|
## Check User
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
In this exercise you will make a script `check-user.sh` that will take 2 arguments and return information about the selected user, always ended by a new line.
|
||
|
|
|
||
|
|
The first argument will be a flag defining the behavior of the script:
|
||
|
|
- `-e`: check if the user exists, returns `yes` or `no` appropriately.
|
||
|
|
- `-i`: returns information about the user.
|
||
|
|
|
||
|
|
The second argument will be the name of the checked user.
|
||
|
|
|
||
|
|
> The information about the user will be formatted in the same way it appears in `/etc/passwd`.
|
||
|
|
|
||
|
|
### Usage
|
||
|
|
|
||
|
|
```console
|
||
|
|
$ ./check-user.sh -e root
|
||
|
|
yes
|
||
|
|
$ ./check-user.sh -i root
|
||
|
|
root:x:0:0:root:/root:/bin/bash
|
||
|
|
$ ./check-user.sh -e unknown
|
||
|
|
no
|
||
|
|
$ ./check-user.sh -i unknown
|
||
|
|
$
|
||
|
|
```
|
||
|
|
|
||
|
|
> Your results may appear slightly different.
|
||
|
|
|
||
|
|
### Error handling
|
||
|
|
|
||
|
|
All errors will print a specific message on **stderr** (ending with a newline) and returns a specific non-zero value:
|
||
|
|
- Wrong number of arguments: `"Error: expect 2 arguments"`, returns `1`.
|
||
|
|
- First argument different from `-e` or `-i`: `"Error: unknown flag"`, exit with `1`.
|
||
|
|
|
||
|
|
### Hints
|
||
|
|
|
||
|
|
> `man getent` will be a great resource to explore
|
||
|
|
> [List Linux users](https://linuxize.com/post/how-to-list-users-in-linux/)
|