Bash Variable Area Leak

Question

Usually, I see questions that people cannot access variables from outside their scope. However, I seem to be experiencing the opposite: I see variables still having values ​​from the inner areas that they should have left after that. For example (creating svn aliases similar to git aliases ):

function svn() {
    case $@ in
        alias*) shift 1;
            for i in "$@"; do
                if [[ "$i" == "-t" ]];
                then
                    j="$i,$j"
                elif [[ "$i" == "-f" ]];
                    k="$i,$j"
                fi
            done

            echo "i = $i"
            echo "j = $j"
            echo "k = $k"
        ;;
    esac
}

script , bash ( ). "-t" "-f", , "$ i", "$ j" "$ k" script , script. Ubuntu 15.04, Ctrl-X Ctrl-V, GNU bash, 4.3.30 (1) -release (x86_64-pc-linux-gnu).

, bash, , ( , ). script ( ), export, . ?

Answer 1

:

• , . . , export .

   export LESS_OPTIONS=-R   # export so `less` sees this variable
   less
  

  , .

• . local. , for i in "$@", $i .

  svn() {
      local i j k
  
      case $@ in
          ...
      esac
  }
  

, . , .