쉘스크립트(shell script) - 메뉴얼

http://wiki.kldp.org/HOWTO/html/Adv-Bash-Scr-HOWTO/index.html
-한글

http://tldp.org/LDP/abs/html/
-위의것 원문

http://www.gnu.org/software/bash/manual/bash.pdf
-영어

http://linuxconfig.org/Bash_scripting_Tutorial#17-1-bash-addition-calculator-example
- 쉘 스크립트 간단예제