dir --list files directories in current directory
mkdir rst, test --make two directories at current folder, called rst & test
cls --clear screen
where python --show file path of a program
tree --show tree structure of current directory and within
systeminfo --show every details about your computer
shutdown -f -t 636 --time shutdown. -f refers to force shutdown; -t refers to time in seconds
systeminfo >c:\systeminfo.txt --output cmd output to text file. Needs admin access
Create a .cmd file, save commands in the file and double click it.
Zip File With Password
zip -er archive.zip ./ cd to directory and use the code. enter pw.
for loops
for i in $( ls ); do echo $i; done
Show / Hide hidden folders/files
defaults write com.apple.finder AppleShowAllFiles YES
killall Finder
defaults write com.apple.finder AppleShowAllFiles NO
killall Finder
Get Password
security find-generic-password -ga "WiFi_Name" --show wifi password
ifconfig | less --show ip address, less make it output line by line. Press "q" to quit.
sudo su --change to root user
echo $PATH --prints out path variables
ls -a --list all directories & files (including hidden ones)
ls -1 --change to vertical view (number 1)
ls -l --list date of modification & read/write, etc. (letter L)
cd --go back one directory before
cd .. --go up one level
cd ~ --go back to login base directory
cd \ --go back to system root directory
cd ~desktop --go to desktop directory
cd /java1.8* --* is a wild card
open . --open current directory in Finder
ls --list files and directories
brew list --list of packages installed using homebrew
clear --clear screen
mkdir -p folder1/folder2/folder3 --make nested directories
sudo rm -r directoryname --delete directory and descending files, but WITH a prompt
sudo rm -rf directoryname --delete directory and descending files, but WITHOUT a prompt. rf = recursive, force.
rmdir projectfolder --delete folder if empty
apt list --installed --check installed software in Ubuntu
unzip kafka-manager-1.1.zip --unzip file
sudo mv target/kafka-manager-1.1.zip ~/ --cut and paste file from current directory to ~/
sudo cp target/kafka-manager-1.1.zip ~/ --copy and paste file from current directory to ~/
sudo rm target/kafka-manager-1.1.zip --delete file
history | grep "iodbctest" --search history of a particular command
tail -f filename --live updates from a particular file, eg. error logs
chmod 777 dirOrfile -- 777: no restriction for all `(rwxrwxrwx)
chmod -R 777 dirOrfile -- grant 777 permissions to all files/folders in directory
tmux --quick start for a tmux session
tmux new -s session_name --start a commandline session direct in the os, will not be subjected to timeout if any.
Ctrl + B (release then select) " --split horizontally
Ctrl + B (release then select) % --split vertically
Ctrl + B (release then select) arrow-key --switch to another window
Ctrl + B (release then select) CTRL + arrow-key --adjust window size
Ctrl + B (release then select) [ --scroll up and down within a window with arrow keys
Ctrl + D --close window / alternatively, type exit
tmux a-t session_name --go back to same session
Command+D --Split current window vertically
Command+Shift+D --Split current window horizontally
Ctrl+Alt+Left/Right/Up/Down --Move between window (panes)
Ctrl+D Close window (pane). Could also type exit
Command+Alt+2/3/4 Switch to iTerm window number 2 (or 3, 4, etc)
Command+T New window in new tab
Command+Left/Right Move between tabs
Ctrl+alt+t --open Terminator
Ctrl + shift + o --split horizontal
Ctrl + shift + e --split vertical
http://www.nncron.ru/help/EN/working/cron-format.htm
Key thing is to store the cronjob statement into a file called crontab at the root. Add MAILTO="" to the top so that email will not be sent to the terminal.
* * * * * command to execute
│ │ │ │ │
│ │ │ │ └─── day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0)
│ │ │ └──────── month (1 - 12)
│ │ └───────────── day of month (1 - 31)
│ └────────────────── hour (0 - 23)
└─────────────────────── min (0 - 59)
0 10-16 * * 1-5 /path/to/script/script.sh --every hour from 10am to 4pm, Mon to Fri
*/5 * * * * /path/to/script/script.sh --every 5 minutes
crontab -l --list of cronjobs
env EDITOR=nano crontab -e --edit cronjobs in nano
*/10 * * * * /Users/xx/anaconda3/bin/python /path/to/script/script.py --run python script
Live editor: https://crontab.guru
ipconfig getifaddr en0 -- get wifi ip address
sudo systemsetup -getremotelogin -- checks if ssh remote login is on/off
sudo systemsetup -setremotelogin on -- enable ssh
ssh [email protected] -- from another computer, enter ssh followed by username@ip_address
TextEdit editor
open -a TextEdit .bash_profile
cat test.txt --prints out entire file contents
less test.txt --prints out a small portion of file contents. arrow up-down to scroll. Q to quit.
head test.txt --prints first 5 lines of the file
touch test.txt --create new file
> filename.txt --create new file
mv test.txt test1.txt --rename file from test to test1
echo "hello there" >> test.txt --append text to file. create file if not exist.
echo "hello there" > test.txt --replace text to file's contents. create file if not exist.
nano .bash_profile --open bash profile; in Mac
nano ~/.profile --open bash profile; in Ubuntu
ctrl + o --save / press enter after this command
ctrl + x --exit
ctrl + D --close python, pyspark session
alt + / --scroll to end of file (Win)
CTRL + e --go to end of line (Mac)
F6 or Ctrl+W --search
Shift + Insert --paste from clipboard
Alt + U --undo
CTRL + Spacebar --move cursor to next word
sudo apt-get update --update latest package versions
sudo apt-get install package_name --install package
sudo apt-get remove package_name --uninstall package, keep config files
sudo apt-get purge package_name --uninstall package, remove config files
sudo apt-get purge --auto-remove package_name --uninstall package, remove config files and it's dependencies
apt list --installed --list installed packages
apt list --installed tableau"*" --list install package, using a wild card
apt list --installed | less --list installed packages, line by line. press q to exit
sudo dpkg -i installer_name --install .deb installers (-i = install)
dpkg -l --list installed packages
dpkg -l | grep installer_name --list specific package
pwd --show full directory path (print working directory)
locate filename --locate all file names containing the word, includes full path
which bash --shows path where command/exe is installed in
sudo find / -name "*iodbc*" --find packages
nano ~\.bashrc --create & open bashrc file
alias npp='notepad++' --assign an alias in the file
source ~\.bashrc --reload file
hdfs dfs -- show all commands
hdfs dfs -ls --list directory contents in hdfs
hdfs dfs -put foldername foldername --copy folder and all contents from edge and paste in hdfs datanode
new-item newfile.txt --create new file. Note to type in file when prompted "type" after pressing enter.