Shell技巧(一)
NORMAL=$(tput sgr0)GREEN=$(tput setaf 2; tput bold)YELLOW=$(tput setaf 3)RED=$(tput setaf 1)function red() { echo -e "$RED$*$NORMAL"}function green() { echo -e "$GREEN$*$NORMAL"}function yellow() { echo -e "$YELLOW$*$NORMAL"}# To print successgreen "Task has been completed"# To print errorred "The configuration file does not exist"# To print warningyellow "You have to use higher version."

?使用tput来设置输出的颜色，更多使用见：http://linux.101hacks.com/ps1-examples/prompt-color-using-tput/

2.打印调试信息

function debug() {    if [[ $DEBUG ]]    then        echo ">>> $*"    fi}# For any debug messagedebug "Trying to find config file"

?3.打印脚本的使用信息

cat << EOFUsage: myscript <command> <arguments>VERSION: 1.0Available Commands    install - Install package    uninstall - Uninstall package    update - Update package    list - List packagesEOF

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4.没有赋值时使用默认值

URL=${URL:-http://localhost:8080}

5.获取字符串长度

if [ ${#authy_api_key} != 32 ]then  red "you have entered a wrong API key"  return $FAILfi

?6.设置输入超时

READ_TIMEOUT=60read -t "$READ_TIMEOUT" input# if you do not want quotes, then escape itinput=$(sed "s/[;\`\"\$\' ]//g" <<< $input)# For reading number, then you can escape other charactersinput=$(sed 's/[^0-9]*//g' <<< $input)

?7.获取文件夹名和文件名

# To find base directoryAPP_ROOT=`dirname "$0"`# To find the file namefilename=`basename "$filepath"`# To find the file name without extensionfilename=`basename "$filepath" .html`

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