License: (CC 3.0) BY-NC-SA

Tips

function argument

• ”$@” can stop arguments split, but also stop shell expandation
• array: a=(1 2 3); for i in ${a[@]}; do echo $i; done; echo ${#a[@]}; echo ${a[1]}
• ${var#*str} substr after first str
• ${var##*str} substr after last str
• ${var%str*} substr before last str
• ${var%%str*} substr before first str