sudo apt-get install xfce4 vnc4server

vncserver

vim ~/.vnc/xstartup


#!/bin/sh
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
startxfce4 &

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey

vncserver -kill :1

split -n l/5 your_file.txt

grep --colour='auto' -P '[^\x00-\x7]' file

LC_ALL=C tr -dc '\0-\177' <file >newfile

cat $file|iconv -f utf8 -c -t ascii//IGNORE

lncli closechannel <fund_txid> [fund_tx_vout_NO]

vim /etc/systemd/system/bitcoind.service

[Unit]
Description=Bitcoin daemon
After=network.target

[Service]
ExecStart=/opt/node/bitcoin/bin/bitcoind -daemon -conf=/opt/node/bitcoin/blockdata/bitcoin.conf -pid=/run/bitcoind/bitcoind.pid
# Creates /run/bitcoind owned by bitcoin
RuntimeDirectory=bitcoind
RuntimeDirectoryPreserve=yes
User=ubuntu
Type=forking
PIDFile=/run/bitcoind/bitcoind.pid
Restart=on-failure
StandardOutput=/var/log/bitcoind.log
StandardError=/var/log/bitcoind.log

# Hardening measures
####################

# Provide a private /tmp and /var/tmp.
PrivateTmp=true

# Mount /usr, /boot/ and /etc read-only for the process.
ProtectSystem=full

# Disallow the process and all of its children to gain
# new privileges through execve().
NoNewPrivileges=true

# Use a new /dev namespace only populated with API pseudo devices
# such as /dev/null, /dev/zero and /dev/random.
PrivateDevices=true

[Install]
WantedBy=multi-user.target

systemctl daemon-reload

systemctl enable bitcoind

systemctl stop bitcoind
systemctl start bitcoind

systemctl status bitcoind.service

cat /tmp/xxx.txt|sort -u | awk '{print length($0), $0}'  | sort -k2,2n -k1,1n -k3,3 |cut -d" " -f2-|less

# echo hello world|xargs echo $1 $2

hello world