2.11. 2017-12-25

2.11.1. 上节课回顾

2.11.2. 本节内容

${#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 enter\n"}'

640*480

/proc/cmdline