The command below can be used to convert a string into a valid filename. Uppercase letters are converted to lowercase, all difficult characters are removed and spaces are changed to underscores.
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echo "#cLEa:n (%FILE%)" | tr [:upper:] [:lower:] | tr -d "[]()&~@#%^&*()_+=;:,\$" | tr " " "_" |
This example will output 'clean_file'.
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