reverse the order of characters in a string

Question

In string \"12345\", out string \"54321\". Preferably without third party tools and regex.

Answer 1

If var=12345:

bash for((i=0;i<${#var};i++)); do rev="$rev${var:~i:1}"; done

sh c=$var; while [ "$c" ]; do rev=$rev${c#"${c%?}"}; c=${c%?}; done

echo "var: $var, rev: $rev"

Run it:

$ rev
var: 12345, rev: 54321