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今天这个脚本其实很简单，但很实用，讲的是shell中函数的应用
To turn the functions in this chapter into a library for use in other scripts, extract all the functions and concatenate them into one big file. If we call this file library.sh, a test script that accesses all of the functions might look like this:
#!/bin/sh# Library test script. library.shinitializeANSIechon "First off, do you have echo in your path? (1=yes, 2=no) "read answerwhile ! validint $answer 1 2 ; do echon "${boldon}Try again${boldoff}. Do you have echo " echon "in your path? (1=yes, 2=no) " read answerdoneif ! checkForCmdInPath "echo" ; then echo "Nope, can't find the echo command."else echo "The echo command is in the PATH."fiecho ""echon "Enter a year you think might be a leap year: "read yearwhile ! validint $year 1 9999 ; do echon "Please enter a year in the ${boldon}correct${boldoff} format: " read yeardoneif isLeapYear $year ; then echo "${greenf}You're right! $year was a leap year.${reset}"else echo "${redf}Nope, that's not a leap year.${reset}"fiexit 0 应用函数，我们就可以复用我们的脚本。
值得注意的是 $ . tinyscript.sh ，就是在当前shell下执行脚本，不加"."或source
则会在子shell下执行脚本，可能会有不同的情况发生，值得注意。
本文转自hb_fukua 51CTO博客，原文链接：http://blog.51cto.com/2804976/597476，如需转载请自行联系原作者