../環境変数
30 Bash Script Examples https://linuxhint.com/30_bash_script_examples/
https://www.macs.hw.ac.uk/~hwloidl/Courses/LinuxIntro/x695.html
https://www.guru99.com/introduction-to-shell-scripting.html
1. whois
echo
echo "Printing text with newline" echo -n "Printing text without newline" echo -e "\nRemoving \t backslash \t characters\n"
2. sleep
echo “Completed”