# Password Generator

## 1. File Checks Using `[[...]]`

[[ ! -f "$file" ]]

This line checks **if the password file does not exist**, and creates it if needed.

| Expression | Meaning |
|----------------|-------------------------------------------------------------------------|
| `[[ ... ]]` | Bash's keyword for conditional expressions |
| `!` | Logical negation – inverts the result |
| `-f "$file"` | Returns true if `$file` **exists** and is a **regular file** |
| `-e "$file"` | (Alternative) Returns true if file exists (directory, symlink or file) |
| `-d "$file"` | Returns true if file is a **directory** |

### Example:

[ -f "file.txt" ] && echo "file exists"

## 2. `grep -q "^$name :" "$file"`

This line checks if a given password **name already exists** in the file.

| Part | Meaning |
|------------------------------|---------------------------------------------------------------|
| `grep` | Searches for patterns in files |
| `-q` | Quiet mode – no output, just returns success/failure |
| `^$name :` | [regex](https://www.sitepoint.com/learn-regex/): matches only lines that **start** with "`$name :`" |
| `"$file"` | File to search within (`passwords.txt`) |

### 3. Code Walkthrough

file="passwords.txt"

if [[ ! -f "$file" ]]; then
    touch "$file"
fi

**Checks if the password file exists**, if not, creates it using `touch`.

echo "Enter the number of characters"
read len

if (( len > $file; then
    echo "saved to passwords.txt"
else
    echo "Couldn't save the password"
    echo "password: $p"
fi

## 4.`(tr -dc 'A-Z' < /dev/urandom | head -c1)`
`/dev/urandom` :special file in Unix-like systems that provides an endless stream of random bytes.
`tr -dc 'A-Z'` : deletes all bytes except the characters from 'A-Z' (c-complement).
`tr` : stands for translate and is used for transforming or deleting specific characters from its input.
`head -c1`

## Clipboard Option (`xclip`)

if command -v xclip >/dev/null; then
    echo "$p" | xclip -selection clipboard
    echo "Copied to clipboard"
else
    echo "xclip is NOT installed"
fi

- Checks if `xclip` is installed
- `command -v xclip` return the path to the xclip if its installed.
- `>/dev/null` discards the output, so nothing is displayed to the user.
- The `-selection clipboard` option tells xclip to place the input text into the system clipboard, so it can be pasted elsewhere with a standard paste operation (e.g., Ctrl+V).

## Sample Output

Enter the number of characters
> 10

Choose type:
1 - alpha-numeric
2 - alpha-numeric + symbols
> 2

Enter the name of the password:
> github

⚠️ A password named github already exists.
Do you want to replace it?? (y/n): y
saved to passwords.txt
Copied to clipboard

## Summary Table

| Concept | Tool/Command | Meaning/Purpose |
|---------------|------------------|---------------------------------------------|
| `[[ -f FILE ]]` | File existence check | True if file exists and is regular |
| `grep -q` | Quiet match | True if pattern is found |
| `tr -dc` | Char whitelist | Filters characters |
| `shuf`, `fold`| Random shuffle | Mixes final password |
| `xclip` | Clipboard tool | Copies password |

# File organizer:
- Organizes files based on extension and file type.
- deletes all the duplicate files(files with same name and bytes) and sends them to bin
- modifies the path of ur original files and creates a backup to your previous file system just in case.