tr (lower case) is a Unix command to replace or delete characters in a string of text. The most common use is:
tr "string1" "string2"
which copies the standard input to the standard output, replacing each character from "string1" with the corresponding character from "string2". For example, this tr command will encode what you type as rot13:
tr 'a-zA-Z' 'n-za-mN-ZA-M'

  TR is what the gang of punks calls itself in Suburbia (the punk-rock classic, not the Eric Bogosian/Richard Linklater version). It Stands for "The Rejected". They make one get it branded on them before they can join the gang and stay in the squat.

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