shell中函数的应用
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2022-04-25 15:13:58
to turn the functions in this chapter into a library for use in other scripts, extract...
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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