shell function

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Use function in your script: =

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fun:

#!/bin/bash#function definationfunc() { echo "function demon"; ls; echo "----------"; }funcwelcome() { echo "Hi $1 and $2"; }welcome joseph stevenset jane amyecho $*welcome joseph stevenecho $1 $2

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The Library File: =

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my_login:

#!/bin/echo Waring: This login library should be sourced!usr_name() { echo "your name?"read u_namecase$u_namein"joseph" ) echo "Well come!"   return 0;;"Joseph" )echo "Well come!"    return 0;;*)echo "Sorry, I don't know you!"    return 1    ;;esac   }

system:

#!/bin/bashsource my_loginusr_nameif [ "$?" -eq 0 ]; thenecho "login success!"fi