# cheat-sheet

My cheat sheet for commands I have trouble remembering.

## Find and copy files by extension recursively

```find . -name '*.pdf' -exec cp -r {} /home/jpickard/pdffiles \;```

## 7-Zip compression (p7zip)

```7z a archivename.7z thingtobearchived```

## Recursively unzip
```while [ "`find . -type f -name '*.zip' | wc -l`" -gt 0 ]; do find -type f -name "*.zip" -exec unzip -- '{}' \; -exec rm -- '{}' \;; done```

## Merge PDF files

#### Ghostscript
```gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=mergedfile.pdf -dBATCH file1.pdf file2.pdf```

#### ImageMagick
```convert file1.pdf[0-1] file2.pdf mergedfile.pdf```

## UFW
### Examples

```
ufw status numbered
ufw delete 2
ufw allow from 192.168.1.10 to any port 22 proto tcp
ufw allow in on tailscal0 to interfaceip port 22 from otherdeviceip
ufw reset
```

## List ports Linux is listening on
`sudo lsof -nP -iTCP -sTCP:LISTEN`