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1. First commands

Display the current date and time:
```
date
```
```
date +%Y-%m-%d
```
Display a calendar of the current month:
```
cal
```
For another month:
```
cal 5 2020
```
Check how much free space there is on the disk drives:
```
df
```
```
df -h
```
```
df -h /
```
Display the amount of the free memory:
```
free
```
```
free -h
```

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