# Basics Commands

## Cheat.sh

{% embed url="<https://cheat.sh/>" %}

## Cat: Command not found

Replace `cat` by `tee < <file>`

## Usefull commands

```
adduser username
addgroup groupname
usermod -a -G <groups seperated by commas> <user>

uname -a

#kernel version
uname -r
cat /proc/version

# OS version
lsb_release -a

# Listening ports
netstat -tulpn

id
groups # admin can read logs on /var/log

sudo -l

ps -aux # search for root processes

# see EoP

free # memory
top # process / CPU

# Zip
unzip myzip.zip

# Rar
unrar x archive.rar

# Gunzip
gzip -d filename.gz
gunzip -k filename.gz   //-k keep (don't delete) original file .gz
zcat filename.gz > filename

# Bzip2
bzip2 -d filename.bz2 // This command will not preserve original archive file
bzip2 -dk filename.bz2 // To preserve the original file

# Tar
tar xvf file.tar

# Tar + Gzip
tar -xzvf archive.tar.gz

# Tar + Bz2
tar -xjvf archive.tar.bz2

# Tar + Xz
tar -xJvf archive.tar.xz
```


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