What are other useful commands?

Here are some other useful Linux commands:

List files and directories:
```
ls
```
Use ls -l for detailed information and ls -a to include hidden files.
Change permissions:
```
chmod [permissions] [file]
```
Example: chmod 755 myfile changes the permissions of myfile.
Copy files:
```
cp [source] [destination]
```
Example: cp file.txt /path/to/destination/.
Move or rename files:
```
mv [source] [destination]
```
Example: mv oldname.txt newname.txt.
Remove files:
```
rm [file]
```
Use rm -r [directory] to remove a directory and its contents.
View file contents:
```
cat [file]
```
Use less [file] or more [file] for paginated viewing.
Search for text in files:
```
grep [pattern] [file]
```
Example: grep "search term" myfile.txt.
Display disk usage:
```
df -h
```
This shows disk space usage in a human-readable format.
Check memory usage:
```
free -h
```
This displays memory usage statistics.
Get help for a command:
```
man [command]
```
Example: man ls shows the manual for the ls command.

These commands are fundamental for navigating and managing files in a Linux environment.