马哥教育内部讲义
练习题
课堂笔记
博客作业
${#var} ${var:offset:length} ${var: -length}
${var#*str} ${var##*str} readonly =declare -r
eval
title=ceo ceo=mage echo ${!title}
mktemp
install
expect -c ‘expect “n” {send “pressed entern”}’
640*480
/proc/cmdline