> For the complete documentation index, see [llms.txt](https://notes.morph3.blog/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://notes.morph3.blog/linux.md).

# Linux

## Nfs share mounting

```
mount -t nfs  127.0.0.1:/backup_share /mnt/myfolder -o nolock
```

## Generating shadow hash

Generating sha-512 hashes with python

```
python3 -c 'import crypt;print(crypt.crypt("Password123!", "$6$foobar$"))'
```

Using openssl

```
openssl passwd -6 -salt foobar password123
```

Modifying shadow entry

```
morph3:<hash>:18727:0:99999:7:::
```

## Weird SSH Connections

```
ssh -o KexAlgorithms=+diffie-hellman-group1-sha1 -oHostKeyAlgorithms=+ssh-dss morph3@10.3.3.7 -p22000
```

## Port scanning with nc

```
nc -z -v 10.2.2.86 1-65000 2>&1 | grep succeeded

for i in {1..65535}; do echo $i; done | xargs -I% -P 50 sh -c 'nc -z  -w 1 10.2.2.150 %|grep succeeded'

cat ports.txt | xargs -I% -P 50 sh -c 'nc -z  -w 1 10.2.2.22 %|grep succeeded'
```