\u542b Install DNS tool Find and replace <\/p>\n<\/li>\n<\/ul>\n Check cpu \/ memory usage<\/p>\n<\/li>\n<\/ul>\n Clean zombie\/defunct process<\/p>\n<\/li>\n<\/ul>\n Check connection TLS version<\/p>\n (check “Protocol :…” first then “New, …”)<\/p>\n<\/li>\n<\/ul>\n ssh with grant permission<\/p>\n<\/li>\n<\/ul>\n date format<\/p>\n<\/li>\n<\/ul>\n list folder by date<\/p>\n<\/li>\n<\/ul>\n Get curent public IP<\/p>\n<\/li>\n<\/ul>\n Unzip .gz<\/p>\n<\/li>\n<\/ul>\n grep <\/b><\/p>\n<\/li>\n helper<\/b><\/p>\n<\/li>\n -F<\/p>\n<\/li>\n plain text only, no wildcard and regex <\/p>\n<\/li>\n<\/ul>\n -A{n}<\/p>\n<\/li>\n print after {n} lines<\/p>\n<\/li>\n<\/ul>\n -B{n}<\/p>\n<\/li>\n print before {n} lines<\/p>\n<\/li>\n<\/ul>\n -E ,\u00a0 regex<\/p>\n<\/li>\n<\/ul>\n grep: all files for string<\/p>\n<\/li>\n -r, –recursive\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 like –directories=recurse<\/p>\n<\/li>\n -n, –line-number\u00a0 \u00a0 \u00a0 \u00a0\u00a0 print line number with output lines<\/p>\n<\/li>\n -i, –ignore-case\u00a0 \u00a0 \u00a0 \u00a0\u00a0 ignore case distinctions in patterns and data<\/p>\n<\/li>\n<\/ul>\n<\/ul>\n<\/ul>\n Print memory and data<\/p>\n<\/li>\n<\/ul>\n Be ware of multiple line command in Curl to POST json data<\/p>\n<\/li>\n<\/ul>\n Download certificate<\/p>\n<\/li>\n<\/ul>\n Unzip<\/p>\n<\/li>\n<\/ul>\n View file metadata<\/p>\n<\/li>\n<\/ul>\n Bash character<\/p>\n<\/li>\n<\/ul>\n Test database SQL command<\/p>\n<\/li>\n<\/ul>\n Check apt package version<\/p>\n<\/li>\n<\/ul>\n Check pip package version<\/p>\n<\/li>\n<\/ul>\n Multiple line command.\u00a0 by “\\”<\/p>\n<\/li>\n<\/ul>\n Replace string with “sed”<\/p>\n<\/li>\n<\/ul>\n [Bash] Enable error interrupting\u00a0<\/p>\n<\/li>\n<\/ul>\n Show datetime<\/p>\n<\/li>\n<\/ul>\n Remove all files exclude specific file<\/p>\n<\/li>\n<\/ul>\n Linux file sharing<\/p>\n<\/li>\n<\/ul>\n Filter string and column<\/p>\n<\/li>\n<\/ul>\n Make restful call and get response<\/p>\n<\/li>\n<\/ul>\n Download GitHub release<\/p>\n<\/li>\n<\/ul>\n Install\u00a0mkpasswd<\/p>\n<\/li>\n<\/ul>\n Install\u00a0<\/p>\n<\/li>\n<\/ul>\n Generate self-signed SSL cert<\/p>\n<\/li>\n<\/ul>\n Check if script not existed and run<\/p>\n<\/li>\n<\/ul>\n Check if process existed<\/p>\n<\/li>\n<\/ul>\n Append string to file<\/p>\n<\/li>\n<\/ul>\n Get http status code<\/p>\n<\/li>\n<\/ul>\n Local mail box<\/p>\n<\/li>\n<\/ul>\n While loop infinity<\/p>\n<\/li>\n<\/ul>\n Print log to file by datetime<\/p>\n<\/li>\n<\/ul>\n Check the collected<\/p>\n<\/li>\n yum \u5217\u51fa\u6240\u6709 package \u53ef\u88dd\u7248\u672c<\/p>\n<\/li>\n<\/ul>\n Search file content (support .gz, regex co)<\/p>\n<\/li>\n<\/ul>\n Search file or folder<\/p>\n<\/li>\n<\/ul>\n yum\u00a0 search\u641c\u5c0b package by keyword<\/p>\n<\/li>\n<\/ul>\n Install nodeJS<\/p>\n<\/li>\n<\/ul>\n Install pip3<\/p>\n<\/li>\n<\/ul>\n \u00a0\u00a0\u00a0\u00a0\u00a0sudo apt-get install python3-pip<\/p>\n Install nethogs (network usage)<\/p>\n<\/li>\n<\/ul>\n Install htop<\/p>\n<\/li>\n<\/ul>\n Jupyter from .ipynb to .py<\/p>\n<\/li>\n<\/ul>\n \u767c url request and show the time<\/p>\n<\/li>\n<\/ul>\n “No package top available.<\/p>\n<\/li>\n<\/ul>\n About compressing: Zip, Unzip<\/p>\n<\/li>\n<\/ul>\n Install ssh for ubuntu<\/p>\n<\/li>\n<\/ul>\n Install Remote GUI for Ubuntu<\/p>\n<\/li>\n<\/ul>\n Make shortcut to command<\/p>\n<\/li>\n<\/ul>\n Auto apply ssh to linux:\u00a0 add empty Find regex string not include by awk<\/p>\n<\/li>\n<\/ul>\n Cron Job will lost PATH<\/p>\n<\/li>\n<\/ul>\n\\n<\/code> \u7684\u5b57\u4e32\u4e0d\u80fd\u76f4\u63a5\u7528 echo \u53bb base64, \u5148\u653e\u5230 file \u88e1\u9762\u624d\u4e0d\u6703\u76f4\u63a5\u88ab\u5ffd\u7565<\/p>\n<\/li>\ndig<\/code><\/p>\napt-get install dnsutils<\/code><\/p>\n<\/li>\nsed -i -e 's\/abc\/XYZ\/g' \/tmp\/file.txt\n<\/code><\/pre>\n\n
kubectl exec -it pod_name -n namespace -- sh \n# cpu usage\ncat \/sys\/fs\/cgroup\/cpu\/cpuacct.usage\n \n# for memory usage\ncat \/sys\/fs\/cgroup\/memory\/memory.usage_in_bytes \n## to MB\ncat \/sys\/fs\/cgroup\/memory\/memory.usage_in_bytes | awk '{ foo = $1 \/ 1024 \/ 1024 ; print foo \"MB\" }'\n<\/code><\/pre>\n\n
# do work\nreboot\n\n# grep all defunct\nps -ef | grep -i defun\n\n# try killing\nkill -9 27950\nkillall -9 defunct\n<\/code><\/pre>\n\n
$ openssl s_client -connect example.com:443\n\n---\nNew, TLSv1.3, Cipher is TLS_AES_128_GCM_SHA256\nServer public key is 256 bit\n---\nSSL-Session:\n\u00a0 \u00a0 Protocol\u00a0 : TLSv1.2\n---\n<\/code><\/pre>\n\n
cp \/mnt\/c\/xxx.pem ~\/.ssh\/.\nchmod 600 ~\/.ssh\/xxx.pem\nssh -i ~\/.ssh\/xxx.pem azureuser@x.x.x.x\n<\/code><\/pre>\n\n
date '+%Y-%m-%d %H:%M:%S'\n\n# diff month`\ndate -d '-1 month' +'Last month was %Y\/%m\/%d?'\n<\/code><\/pre>\n\n
ls -lt\n<\/code><\/pre>\n\n
curl ifconfig.me\n<\/code><\/pre>\n\n
gzip -d xxx.gz\n<\/code><\/pre>\n\n
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grep -r \"texthere\" .\ngrep -rni \"string\" * \n<\/code><\/pre>\n\n
echo $(date --iso-8601=ns) $(free -k | grep ^M | awk -F' ' '{print $1\",\"$2\",\"$3\",\"$4 }') >> \/tmp\/mem_report.txt\n<\/code><\/pre>\n\n
if then else<\/code> condition<\/p>\n<\/li>\n<\/ul>\n## example as follows: cat not working\n\nif echo \"400\" | grep \"200\";\nthen\n\u00a0 \u00a0 echo \"Passed\"\nelse\n\u00a0 \u00a0 echo \"Failed\" \n\u00a0 \u00a0 curl -X POST 'xxx' \\\n\u00a0 \u00a0 -H 'Content-Type: application\/json' \\\n\u00a0 \u00a0 -d \"$(cat <<EOF\n\u00a0 \u00a0 { \n\u00a0 \u00a0 \u00a0 \u00a0 \"test\": \"test\", \n\u00a0 \u00a0 }\n\u00a0 \u00a0 EOF \n\u00a0 \u00a0 )\"\nfi\n<\/code><\/pre>\n\n
export BASH_VARIABLE=\"[1,2,3]\" \ncurl http:\/\/localhost:8080\/path -d \"$(cat <<EOF \n{ \n\u00a0 \"name\": $BASH_VARIABLE, \n\u00a0 \"something\": [ \n\u00a0 \u00a0 \"value1\", \n\u00a0 \u00a0 \"value2\", \n\u00a0 \u00a0 \"value3\" \n\u00a0 ] \n} \nEOF \n)\" -H 'Content-Type: application\/json'\n<\/code><\/pre>\n\n
echo -n | openssl s_client -connect $HOST:$PORTNUMBER -servername $SERVERNAME \\ \n\u00a0 \u00a0 | openssl x509 > \/tmp\/$SERVERNAME.cert\n<\/code><\/pre>\n\n
# 1\ntar -xf archive.tar.gz -C .\/folder\n\n# 2\ngunzip file.gz\ngunzip < file.tar.gz | tar xvf -\n<\/code><\/pre>\n\n
strings file.exe | egrep '^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+$'\n<\/code><\/pre>\n\n
$ => variable\n${} => separate variable in string\n$() => run function inside then output to variable\n(()) => could run basic +-x%\n\n<\/code><\/pre>\n\n
#!\/bin\/bash\u00a0 \u00a0 \u00a0 \u00a0 \necho Start Executing SQL commands\nsqlplus <user>\/<password> @file-with-sql-1.sql\nsqlplus <user>\/<password> @file-with-sql-2.sql\n<\/code><\/pre>\n\n
apt-get -s install tesseract-ocr\n<\/code><\/pre>\n\n
pip show Jinja2\n<\/code><\/pre>\n\n
docker run -d --name jaeger \\\n\u00a0 -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \\\n\u00a0 -p 5775:5775\/udp \\\n\u00a0 ...\n<\/code><\/pre>\n\n
# current file\nsed -i \"s\/{{TargetStr}}\/{{NewStr}}\/g\" deploy.yaml\n\n# Expose to another file\nsed \"s\/{{TargetStr}}\/{{NewStr}}\/g\" deploy.yaml > new.yaml\n\n# When including special charactor(e.g. \/), use \"|\" instead.\nsed -i \"s|{{TargetStr}}|{{NewStr}}|g\" deploy.yaml\n<\/code><\/pre>\n\n
set -e\n<\/code><\/pre>\n\n
$(date -d '-1 month' '+%Y-%m-%d')\n## print: 2020-08-08\n## Use \\%\u00a0 in crontab\n<\/code><\/pre>\n\n
find . ! -name 'file.txt' -type f -exec rm -f {} +\n\nfind . ! -name '2020*' -exec rm -f {} +\n<\/code><\/pre>\n\n
sudo npm install -g http-server\nhttp-server -o\n<\/code><\/pre>\n\n
| awk '\/pattern\/{ print $0 }'\n# $0 all, $1 column 1, $2 column 2, ...\n<\/code><\/pre>\n\n
curl -i https:\/\/xxx.com\n<\/code><\/pre>\n\n
wget --no-check-certificate --content-disposition https:\/\/github.com\/joyent\/node\/tarball\/v0.7.1\n\n# --no-check-cerftificate was necessary for me to have wget not puke about https\ncurl -LJO https:\/\/github.com\/joyent\/node\/tarball\/v0.7.1\n\n# Just download file\ncurl -OJ https:\/\/xxx.com\/xxx.zip\n<\/code><\/pre>\n\n
yum install expect\n<\/code><\/pre>\n\n
yum install httpd-tools\n<\/code><\/pre>\n\n
$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout mykey.key -out mycert.pem\n<\/code><\/pre>\n\n
ps aux | grep \"app\/main.py\" | grep -v grep\nif [ $? != 0 ]; then\n\u00a0 python3 \/srv\/app\/main.py\nfi\n<\/code><\/pre>\n\n
ps aux | grep \"your_running_command\" | grep -v grep\n<\/code><\/pre>\n\n
echo $'first line\\nsecond line\\nthirdline' >> foo\n<\/code><\/pre>\n\n
curl -I http:\/\/www.example.org\ncurl -v http:\/\/www.example.org\u00a0 \u00a0 # -v == --verbose\n<\/code><\/pre>\n\n
\/var\/mail\/{USER}\n\/var\/spool\/mail\/{USER}\n<\/code><\/pre>\n\n
while true; do echo hi; sleep 5; done\n<\/code><\/pre>\n\n
ls -al > output_$(date +\"%m_%d_%Y\")\n<\/code><\/pre>\n\n
yum list {{package}} --showduplicates | sort -r\n<\/code><\/pre>\n\n
zgrep -inE '\/api\/v2.*disable' *\u00a0 \u00a0 \u00a0 \u00a0 # regex search all files\n<\/code><\/pre>\n\n
find \/ -type f -name {{filename}}\n<\/code><\/pre>\n\n
yum search {{keyword}}\n<\/code><\/pre>\n\n
#delete if needed\nsudo apt-get --purge remove node\nsudo apt-get --purge remove nodejs\nsudo apt-get install nodejs\n#Use 'node' command rather than 'nodejs'\nupdate-alternatives --install \/usr\/bin\/node node \/usr\/bin\/nodejs 10\n<\/code><\/pre>\n\n
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apt-get install build-essential libncurses5-dev libpcap-dev\ngit clone https:\/\/github.com\/raboof\/nethogs\nmake && sudo .\/src\/nethogs\nmake install && hash -r && nethogs\n\n# sudo make uninstall\n<\/code><\/pre>\n\n
sudo yum install epel-release\nsudo yum updatess\n\nsudo yum install htop\n<\/code><\/pre>\n\n
On the command line, you can use nbconvert:\n$ jupyter nbconvert --to script [YOUR_NOTEBOOK].ipynb\nAs a bit of a hack, you can even call the above command in an IPython notebook by pre-pending ! (used for any command line argument). Inside a notebook:\n!jupyter nbconvert --to script config_template.ipynb\n<\/code><\/pre>\n\n
curl -o \/dev\/null -s -w \"%{time_connect} + %{time_starttransfer} = %{time_total}\\n\" <YOUR_URI><\/code><\/pre>\n\n
Error: Nothing to do\"\n# htop seems to be available in the EPEL repo. Try yum install epel-release, then yum install htop again.\nyum install epel-release\n<\/code><\/pre>\n\n
# zip with hidden file (.htaccess)\nsudo find . -type f -name '.*' -print | sudo zip newZipFile.zip -@\n\n\n# zip all in folder\nsudo zip -r\u00a0 {ZIPNAME}.zip {FOLDER_PATH1} {FOLDER_PATH2} {FOLDER_PATH3} ...\n\n\n# unzip to specific folder\nsudo unzip {ZIPNAME}.zip -d {FOLDER_PATH}\n\n# browser into zip file\nunzip -l {{zipfile}}\nless {{zipfile}}\nvim {{zipfile}}\n<\/code><\/pre>\n\n
sudo apt-get install openssh-server\n\n# Enable\/Disable root\nvi \/etc\/ssh\/sshd_config\n--\nPermitRootLogin Yes\n--\n\n# (optional) Set allowed IP\nvi \/etc\/hosts.allow\n--\nsshd:192.168.1.88:allow\n--\nvi \/etc\/hosts.deny\n--\nsshd:all:deny\n--\n-> then restart\n\n\n# (optional) restart\nsudo \/etc\/init.d\/ssh restart\n<\/code><\/pre>\n\n
# xfce4\nsudo apt-get install xfce4\n## additional goodies\nsudo apt-get install xfce4-goodies\n<\/code><\/pre>\n\n
alias lc=long-command\n<\/code><\/pre>\nAbout System<\/h1>\n
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ssh<\/code> file to root folder<\/p>\n<\/li>\nXXXstring | awk '$0 !~\/domain\/{print $0}'\n<\/code><\/pre>\n\n
# Set the path back again\nexport PATH={$PATH}\n<\/code><\/pre>\n\n