More tr examples

Translace braces into parantheses:

tr '{}' '()' < inputfile > outputfile

Translate whitespaces to tabs:

echo "This is for testing" | tr [:space:] '\t'

Squeeze repetition of characters using -s:

echo "This      is   for          testing  " | tr -s [:space:]

Delete specific characters using -d:

echo "the geek stuff" | tr -d 't'

Complement the sets using -c option:

echo "my username is 432234" | tr -cd [:digit:]

Remove non-printable characters from a file:

tr -cd [:print:] < file.txt

Join all the lines in a file into a single line:

tr -s '\n' ' ' < file.txt