#!/bin/bash

for f in $(find . -mtime 5 -name "*.gz" -exec zgrep -l --text "40\.\.60" {} +)
do
    echo $f
    DATE=$(date -r $f)
    #echo $DATE
    cp $f $f~back
    gzip -cd "$f~back" | LC_ALL=C sed 's/40\.\.60/40.060/g' | gzip > "$f"
    touch -c -d "$DATE" $f
done