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# from http://mywiki.wooledge.org/BashFAQ/021
string_rep()
{
# initialize vars
in=$1
unset out
# SEARCH must not be empty
test -n "$2" || return
while true; do
# break loop if SEARCH is no longer in "$in"
case "$in" in
*"$2"*) : ;;
*) break;;
esac
# append everything in "$in", up to the first instance of SEARCH, and REP, to "$out"
out=$out${in%%"$2"*}$3
# remove everything up to and including the first instance of SEARCH from "$in"
in=${in#*"$2"}
done
# append whatever is left in "$in" after the last instance of SEARCH to out, and print
printf '%s%s\n' "$out" "$in"
}
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