Bash (Unix Shell)

Bash command are mainly supported MacOS, Linux. On Windows, you can use WSL, it’s easy to setup and can use full-featured.

Note: Terminal ZSH

• Apps: We have many applications such as cmder (Windows), iTerm2 (MacOs),… For me only, I usually WezTerm on MacOS and Linux
• Online: repl.it

• Ctrl + C: interrupt current tasks
• Ctrl + L: clear the screen
• Tab: Autocomplete the commands / directories / file names / …
• Ctrl + Shift + V: pastes from clipboard.
• For a long list: Enter to continue read, q to quit
• Ctrl + A: Move cursor to beginning of the line

# run at once
command_1 && command_2

# using script: file.sh
#!/bin/sh
echo 'some info'
command_1
command_2

# using script: file.sh
# with arguments
$file1 = $1
wc $file1 # word count

# multiple input args
for FILE1 in "$@"; do
  wc $FILE1
done

NAME="defaut" # default value! DON'T HAVE SPACE!!!
# with flags
while getopts n:f: option; do
  case "${option}"
    in
      n) NAME=${OPTARG};;
      f) FILE=${OPTARG};;
  esac
done

# all files / folders containing 'abc'
ls | grep -i abc

# find command lines containing 'abc'
dpkg -l | grep -i abc

# search and extract a part of result
pip show numpy
pip show numpy | sed -n 's/Location: //p'
# /usr/lib/python3/dist-packages