shell中函數的應用_linux shell

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

應用函數，我們就可以複用我們的指令碼。

值得注意的是 $ . tinyscript.sh ，就是在當前shell下執行指令碼，不加"."或source

則會在子shell下執行指令碼，可能會有不同的情況發生，值得注意。