[SOLVED] How can I add x number of characters at the beginning of a string?

Issue

I'm trying to add x number of 0 at the beginning of a string, the number of characters missing is stored on $x, but how can I add them into the string?

echo "$exampleString" | sed -i 's/^/0/'

sed works just fine, but the number of 0 must be typed manually instead of getting from a calculated variable

Solution

You could use printf as such:

x=5
string="test"
printf '%0*d%s\n' "$x" 0 "$string"```

Answered By - user20248374

Answer Checked By - Robin (WPSolving Admin)