读书笔记--101个shell脚本 之#12--函数

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

The Code

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.sh



initializeANSI



echon "First off, do you have echo in your path? (1=yes, 2=no) "

read answer

while ! validint $answer 1 2 ; do

  echon "${boldon}Try again${boldoff}. Do you have echo "

  echon "in your path? (1=yes, 2=no) "

  read answer

done



if ! checkForCmdInPath "echo" ; then

  echo "Nope, can''t find the echo command."

else

  echo "The echo command is in the PATH."

fi



echo ""

echon "Enter a year you think might be a leap year: "

read year



while ! validint $year 1 9999 ; do

  echon "Please enter a year in the ${boldon}correct${boldoff} format: "

  read year

done



if 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}"

fi



exit 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.

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