• Bash
• Linux sed
• awk
• xargs

• bash - How to execute the output of a command within the current shell? - Stack Overflow
• 마지막 pipe 를 source /dev/stdin 으로 해주면 된다.

ls | sed ... | source /dev/stdin

• shell script 파일 내용만으로 새로운 파일을 생성한다.
• AWS user data 에서 shell script 만으로 파일을 생성하려고 사용.
• https://stackoverflow.com/questions/4879025/creating-files-with-some-content-with-shell-script

cat <<EOF >/home/a.config
first line
second line
third line
EOF

• shell - Bash: How to read one line at a time from output of a command? - Unix & Linux Stack Exchange

• Bash Scripting Tutorial for Beginners - LinuxConfig.org
• The Shell Scripting Tutorial
• Linux Shell Scripting Tutorial - A Beginner's handbook
• Shell Scripting Tutorial - Tutorialspoint
• (1) Fix Your Shell Scripts With Shellcheck - YouTube
• Learn Bash by writing an interactive game | Opensource.com
• 3 command line games for learning Bash the fun way | Opensource.com