shell 脚本技巧

1、Give ECHO colors see see!

NORMAL=$(tput sgr0)

GREEN=$(tput setaf ; tput bold)

YELLOW=$(tput setaf )

RED=$(tput setaf )

function red() {

    echo -e "$RED$*$NORMAL"

}

function green() {

    echo -e "$GREEN$*$NORMAL"

}

function yellow() {

    echo -e "$YELLOW$*$NORMAL"

}

# To print success

green "Task has been completed"

# To print error

red "The configuration file does not exist"

# To print warning

yellow "You have to use higher version."

关于上面这个，我个人感觉不是很好，还有别的方法，以后再说吧！

2、打印 Debug 信息

function debug() {

    if [[ $DEBUG ]]

    then

        echo ">>> $*"

    fi

}

# For any debug message

debug "Trying to find config file"

合并成一行：

# From cool geeks at hacker news

function debug() { ((DEBUG)) && echo ">>> $*"; }

function debug() { [ "$DEBUG" ] && echo ">>> $*"; }

3、检查可执行文件是否存在：

OK=

FAIL=

function require_curl() {

    which curl &>/dev/null

    if [ $? -eq  ]

    then

      return $OK

    fi

    return $FAIL

}

其实也就一行就可以解决:function require_curl() {which culr &>/dev/null;}

4、打印命令的使用方式：

cat << EOF

Usage: myscript <command> <arguments>

VERSION: 1.0

Available Commands

    install - Install package

    uninstall - Uninstall package

    update - Update package

    list - List packages

EOF

5、给变量加默认值：

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

6、检查字符串变量的长度：

if [ ${#authy_api_key} !=  ]

then

  red "you have entered a wrong API key"

  return $FAIL

fi

7、半延迟读取数据：

READ_TIMEOUT=

read -t "$READ_TIMEOUT" input

# if you do not want quotes, then escape it

input=$(sed "s/[;\`\"\$\' ]//g" <<< $input)

# For reading number, then you can escape other characters

input=$(sed 's/[^0-9]*//g' <<< $input)

8、获取目录和文件的名称：

# To find base directory

APP_ROOT=`dirname "$0"`

# To find the file name

filename=`basename "$filepath"`

# To find the file name without extension

filename=`basename "$filepath" .html`

此文出自老外，觉得挺好，就译了过来！不算盗版吧，哈哈！

学一点，收获一点。学到的都是自己的！

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shell 脚本技巧

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