Bash/Unix commands I always forget

Bash_I_Forget.log

# where C is the name or path, N is an integer

#check packages installed on ubuntu/debian
dpkg -l | grep NAME

#check mount meta
df -h PATH #or lsblk

#change mount options
id -u
sudo /etc/fstab 

#get change owner 
chown user:group

#get group info
tail /etc/group
groups USER #user

#change group info
groupmod -g N GROUP
usermod -a -G GROUP USER

#add smb user
sudo useradd -M -d /data/shared/USER -s /usr/sbin/nologin -G sambashare USER
sudo mkdir /data/shared/USER
sudo chown USER:sambashare /data/shared/USER
sudo chmod 2770 /data/shared/USER

#linux partition recommendations

#last update 2022
#/(root) remaining 
#/boot 1Gb
#/usr maybe 15gb
#/var  2 GB
#/home *
#/tmp not needed
#swap = RAM under 2gb - 16gb

#ref https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/installation_guide/s2-diskpartrecommend-x86