Tr (Unix)

tr

The tr command
Original author(s)	Douglas McIlroy (AT&T Bell Laboratories)
Developer(s)	Various open-source and commercial developers
Initial release	November 1973; 50 years ago (1973-11)
Repository	openbsd.su/src/usr.bin/tr/
Written in	C
Operating system	Unix, Unix-like, Plan 9, Inferno, OS-9, MSX-DOS, IBM i
Platform	Cross-platform
Type	Command
License	coreutils: GPLv3+ Plan 9: MIT License

tr is a command in Unix, Plan 9, Inferno, and Unix-like operating systems. It is an abbreviation of translate or transliterate, indicating its operation of replacing or removing specific characters in its input data set.