我要评论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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