Linux daily skills (continuous updating)

Cleanup process list

Kill these process that zombie or stopped.

# kill zombie process list
ps -A -ostat,ppid | grep -e '[zZ]' | tail -n +2 | awk '{ print $2 }' | xargs kill -9

# cleanup stopped process list
ps -A -ostat,pid | grep -e '[T]' | tail -n +2 | awk '{ print $2 }' | xargs kill -9

Mandatory logged out user session

Tips: 当出现服务器用户数过多,造成别人登陆不上去,管理员可强行踢出用户

w list current logon sessions, and the kill it with pkill -kill -t [tty]

pkill -kill -t pts/2

Make Tab auto-completion case-insensitive

# If ~./inputrc doesn't exist yet, first include the original /etc/inputrc so we don't override it
if [ ! -a ~/.inputrc ]; then echo "\$include /etc/inputrc" > ~/.inputrc; fi

# Add option to ~/.inputrc to enable case-insensitive tab completion
echo "set completion-ignore-case On" >> ~/.inputrc

Note: to make this change for all users, edit /etc/inputrc

Get the networking connection statistics

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

TIME_WAIT 22
ESTABLISHED 3254   # data transfer state
LAST_ACK 236
FIN_WAIT_1 648
FIN_WAIT_2 581
CLOSING 7
CLOSE_WAIT 4916

Kill the process that bind the specific port

GistURL: https://gist.github.com/allex/8b399a93749703acd780

#!/bin/sh

port=$1
while [[ -z "${port}" ]]; do
    read -p "Please type the port you wanna kill (q to exit): " port
done
[ "${port}" = "q" ] && exit 0;

PID=""
case "`uname `" in
    Linux*)  PID=`lsof -t -i:${port}` ;;
    Darwin*) PID=`lsof -i -n -P | grep ":${port} (LISTEN)" | awk '{print $2}'` ;;
esac

if [ -n "$PID" ];
then
    kill -9 $PID && echo "procss with pid: ${PID} on port ${port} had killed success!"
else
    echo "The specific process with port '${port}' not found. exit";
fi

Usage: ./killport.sh [port]

Find IP address in shell

# OS X may not work except
ip = `hostname -I | cut -d' ' -f1`

# or use complex Linux shell
ip=`ifconfig | sed -n 's/.*inet addr:\([0-9.]\+\)\s.*/\1/p' | grep -v '127.0.' | head -n 1`

Example:

#!/bin/sh
ip=`ifconfig | sed -n 's/.*inet addr:\([0-9.]\+\)\s.*/\1/p' | grep -v '127.0.' | head -n 1`
wget -q -O - http://${ip}:8092/yn/build.hash -H 'Host: st.comm.miui.com' | base64 -d

Compare differences between directories

cp -R $local $bak
rsync $server:$remdir/* $local/
rsync $local/ $server:$remdir/*
diff -wur $local $bak