dyllanwli

$(<command> | grep <something I want to grep> | awk '{print <the line I wants to get, e.g. $1>}')

dyllanwli

cd "C:\Program Files\Docker\Docker"
./DockerCli.exe -SwitchDaemon
# I should switch back if I still needs the original Daemon

dyllanwli

echo "hello world" > a.txt
soffice --headless --invisible --nodefault --nofirststartwizard \
    --nolockcheck --nologo --norestore --convert-to pdf --outdir $(pwd) a.txt
# to run multiple convert just use * as a selector

dyllanwli

# linux command . Copy a file one hundred times

for n in {001..100}; do
    cp file.jpg file-$n.jpg
done

dyllanwli

aws --version
# aws-cli/1.15.30 Python/3.6.5 Darwin/17.6.0 botocore/1.10.30

# move or rename bucket

aws s3 mb s3://[new-bucket]
aws s3 mv s3://old-bucket s3://new-bucket --recursive
# or
aws s3 mb s3://[new-bucket]
aws s3 sync s3://[old-bucket] s3://[new-bucket]

dyllanwli

# start mongodb with --replSet rs
# the rs means replica set name

# if MONGO_INITDB_ROOT_USERNAME was set, then use those init db root username and password


mongo -u <your user name> --authenticationDatabase admin -p <your passowrd>

rs.initiate()

dyllanwli

alias activatejupyter='module load Anaconda/3-5.0.0.1 ; source activate jupyterlab_2.0.1'
alias rm='trash' # to avoid wrong delete 
# use \rm -rf is you still want to delete all file 


# make symbolic link to avoid disk file count usage
# ln -s <the short cut that you want to link (may not be exist)> <the real folder path(must exist)>

dyllanwli

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
# https://serverfault.com/questions/200635/best-way-to-clear-all-iptables-rules
# To answer your question succinctly, no: there would not be any "leftover" rules after flushing every table. In the interest of being thorough however, you may want to set the policy for the built-in INPUT and FORWARD chains to ACCEPT, as well

iptables -P OUTPUT ACCEPT
iptables -t nat -F
iptables -t mangle -F
iptables -F
iptables -X

dyllanwli

git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -D

dyllanwli

!curl -fsSL https://code-server.dev/install.sh | sh
!pip install -qqq pyngrok
from pyngrok import ngrok
url = ngrok.connect(port=9000)
print(url)
!nohup code-server --port 9000 --auth none &