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shdash-shell

Print variables with number of iteration index in dash

I work in dash and I would like to know if there is any method to print variable with index of number of iteration.

CODE : 

var1="a"
var2="b"
var3="c"

tmp=0
while [ $tmp -lt 4 ]
do
    # this is how i imagine it 
    echo $('var'$tmp)  #output should be value of var$tmp
    tmp=$((tmp+1))
done

Thank you!

Solution

  • In POSIX sh, you need to use eval to perform indirect expansion:

    eval "result=\$var$tmp"

    Note that there are much better ways to do this in ksh, bash or other shells; see BashFAQ #6 for a comprehensive discussion of both indirect expansion and indirect assignment spanning all these shells.