What are alternatives to `cat`?

There are several alternatives to the cat command in Linux for viewing and manipulating file contents:

less: A pager that allows you to view the content of files one screen at a time. It supports backward and forward navigation.
```
less filename.txt
```
more: Similar to less, but with more limited navigation options. It displays the content one screen at a time.
```
more filename.txt
```
head: Displays the first few lines of a file (default is 10 lines).
```
head filename.txt
```
tail: Displays the last few lines of a file (default is 10 lines). It can also follow a file in real-time with the -f option.
```
tail filename.txt
tail -f filename.txt
```
tac: Displays the contents of a file in reverse order (last line first).
```
tac filename.txt
```
nl: Displays the contents of a file with line numbers.
```
nl filename.txt
```

These commands provide various functionalities for viewing and manipulating file contents, depending on your needs.