- TCP DUMP:
tcpdump -nqt -s0 -A -i any port 5060 |grep "computer networking" -A 10 -B 10 - Ping with MTU size:
ping 122.152.145.101 -s 1500
- Find & Replace:
find ./hoiio/ -type f -exec sed -i "s/<origin_string>/<new_string>/g" {} + - Repeat Command n times:
for i in {1..10}; do <command>; done - curl with digest auth
curl --digest --user minh:secret https://minh.com/ - trace:
last -x - investigate:
grep -iv ': starting\|kernel: .*: Power Button\|watching system buttons\|Stopped Cleaning Up\|Started Crash recovery kernel' /var/log/messages /var/log/syslog /var/log/apcupsd* \| grep -iw 'recover[a-z]*\|power[a-z]*\|shut[a-z ]*down\|rsyslogd\|ups'
-
Remote Access
ssh -i ~/.ssh/private.key -p 9022 -oKexAlgorithms=+diffie-hellman-group1-sha1 -c aes256-cbc superadmin@10.10.10.10 -
Sample: ~/.ssh/config
Host PREFIX* 172.31.*.*
Port 11922
StrictHostKeyChecking no
IdentitiesOnly yes
UserKnownHostsFile=/dev/null
KexAlgorithms +diffie-hellman-group1-sha1
User minh
IdentityFile ~/.ssh/minh.general.private
ProxyJump SSHJUMPPOINT- install redis-cli by 1 command
wget http://download.redis.io/redis-stable.tar.gz && tar xvzf redis-stable.tar.gz && cd redis-stable && make & cp src/redis-cli /usr/bin/
- CISCO console connect example
sudo screen /dev/ttyUSBO 9600 - Start a new session with session name
screen -S <session_name> - List running sessions / screens
screen -ls - Attach to a running session
screen -x - Attach to a running session with name
screen -r <session_name> - Detach a running session
screen -d <session_name> - Kill session ```screen -X -S <session_name> quit
- generate ssl key & cert
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout selfsigned.key -out selfsigned.crt - print out certificate x509 in text form:
openssl x509 -text -noout -in github_com.csr
- Dock Hide Time
defaults write com.apple.dock autohide-time-modifier -int 0
killall Dock
defaults delete com.apple.Dock autohide-delay- Startup Volume
sudo nvram StartupMute=%01