# cheat-sheet

+ [File Management](https://git.laurelcountycorrections.org/jpickard/cheat-sheet#find-and-copy-files-by-extension-recursively)
+ [Firewall - UFW](https://git.laurelcountycorrections.org/jpickard/cheat-sheet#ufw)
+ [NFS](https://git.laurelcountycorrections.org/jpickard/cheat-sheet#mount-nfs-share-nfs-common-or-nfs-utils)

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`

## Mount NFS Share (nfs-common or nfs-utils)
`sudo mount -t nfs 10.10.0.10:/backups /var/backups`
### /etc/fstab
```
# <file system>     <dir>       <type>   <options>   <dump>	<pass>
10.10.0.10:/backups /var/backups  nfs      defaults    0       0
```

## Merge video files with ffmpeg
```
$ cat files.txt
file 'file 1.mkv'
file 'file 2.mkv'
file 'file 3.mkv'
file 'file 4.mkv'
```
`ffmpeg -f concat -safe 0 -i files.txt -c copy output.mkv`