unix commands

grep -r -i --include \*.cs OpenXml .

copy all files including hidden
rsync -avzP source/* source/.* destination

# list all enabled systemd services
systemctl list-unit-files | grep enabled

# edit systemd service, for instance docker:
systemctl edit --full docker.service 

# turn off global menu with ALT key with ccsm
# https://askubuntu.com/questions/455519/how-to-stop-alt-from-triggering-global-menu

# update mlocate database
updatedb
locate sites-enabled
history | grep "rsync"

# move, copy multiple files
mv -t DESTINATION file1 file2
cp -t DESTINATION file1 file2

# clear history
history -cw && exit

# mount smb share in files => click other locations and connect to server with format smb://192.168.1.81/var/
# the share is mounted in /run/user/1000/gvfs/smb-share:server=192.168.1.81,share=var/

# curl a script and execute it through a pipe
curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -

# don't fail script on failing command
#!/bin/bash
docker stop mycontainer || true

# show group memberships of current user
id -nG

# re login as current user
su - ${USER}

# only ask once for passphrase of rsa keys after reboot

# Add this to your ~/.bashrc:

if [ ! -S ~/.ssh/ssh_auth_sock ]; then
  eval `ssh-agent`
  ln -sf "$SSH_AUTH_SOCK" ~/.ssh/ssh_auth_sock
fi
export SSH_AUTH_SOCK=~/.ssh/ssh_auth_sock
ssh-add -l > /dev/null || ssh-add


# fail2ban unban ip
fail2ban-client set sshd unbanip <my-ip>

# search for apt package containing a file
apt-file update
apt-file search nslookup

# virtual box change uuid of hard disk
VBoxManage internalcommands sethduuid "/home/user/VirtualBox VMs/drupal/drupal.vhd"

# install docker
curl get.docker.com | bash

# grep on multiple keywords
find . | grep -E 'this|that'

# skip permission denied
find . ! -readable -prune -o -print

# replace a character in file, replace é with é in all files that contain é
find . -name '*é*' -execdir bash -c 'cp $1 "${1//é/é}"' _ {} \;
find . -name '*ë*' -execdir bash -c 'cp $1 ${1//ë/ë}' _ {} \;

# show system log since boot
journalctl  -b --no-pager | less

# show system log since specific time
journalctl  -b --since "2017-04-23 11:00" -no-pager | less

# more journalctl commands https://www.digitalocean.com/community/tutorials/how-to-use-journalctl-to-view-and-manipulate-systemd-logs

# if no more log records are written to for instance /var/log/mail.log, try restarting rsyslog

# list open log files:
ps axu
lsof -p 17970 |grep log

# mastering bash - shortcuts for less, command line, fg, bg, xclip, pushd, popd
https://www.blockloop.io/mastering-bash-and-terminal

# edit crontab of current user
EDITOR="nano" crontab -e

# environment variabelen toevoegen aan /etc/environment

# list TCP connections and open ports with process name
sudo netstat -peanut 

# list all autostart services : 
service --status-all
# service toevoegen met supervisor:
https://elithrar.github.io/article/running-go-applications-in-the-background/
als supervisor niet start, foutmelding zien met:
supervisord -c /etc/supervisor/supervisord.conf
let op! # als comment werkt niet goed in supervisor.conf file
# met APP_SETTINGS kun je een app setting t
#service supervisor startoevoegen waarmee je naar een config bestand kunt wijzen

update-rc.d supervisor defaults
update-rc.d supervisor enable

#supervisorctl status
#reload of conf.d supervisor scripts
#supervisorctl reread
#supervisorctl update

SHIFT + pageup = scroll omhoog in terminal
history 
!<numberofcommandtoexecute>

weer ophalen  
curl wttr.in/rotterdam

zoek naar bestanden met extensie (case insensitive) en sorteer op grootte  
find / -iname \*.zip -type f -exec ls -sh {} \; | sort -n

zoek naar bestanden en sluit permission denied uit
find / ! -readable -prune -iname myfiles

zoek grote bestanden  
find -size +100M

toon foldergroottes  
du -sh ./*

ga naar andere shell  
exec /bin/sh

when creating a new user, copy /home/root/.bashrc to the new user directory to get the aliases etc from root

# send zipped file to server
cat ./FILE | bzip2 | pv | ssh USER@FQDN 'bunzip2 > /home/USER/FILE'

# upload to server
scp my_local_file user@serveraddress:/file/path/on/server

# an entire folder recursively
scp -pr path/to/my_local_dir user@serveraddress:/file/path/on/server

# with rsync, including zipped data transfer
rsync -zri src USER@SERVER:/home/USER/path

# copy only new files 
rsync -hvrPt ./* USER@HOST:/REMOTE/PATH

# copy all hidden files
rsync -avzP ~/.[^.]* /mnt/test

# copy files with excludes
rsync -av --progress /media/lex/Data3/DownloadUbuntuChrome/var/www/comiam-najafabad/wordpress/current/ ./html/ --exclude wp-content/themes/iamreservations --exclude wp-content/themes/maxv2 --exclude wp-content/uploads/

# merge two directories
rsync -ia src/ dest/

# active firewall rules
ufw status

# deny access to ssh
ufw deny from x.x.x.x to any port 22

# allow subnet acces to port
ufw allow from 192.168.1.0/24 to any port 3306

# generate rsa key
ssh-keygen -t rsa -b 4096 -C "[email protected]"
# start ssh-agent
eval "$(ssh-agent -s)"
# add key to rsa agent
ssh-add ~/.ssh/id_rsa

# change password of keypair:
ssh-keygen -p -f ~/.ssh/id_rsa

dir for applications:
/opt/myapp

/usr (is unix system resources)
additions to unix system resources can go to
/usr/local

# repeat last commmand and add sudo
sudo !!