摘要： from TheGeekStufftr is an UNIX utility for translating, or deleting, or squeezing repeated characters. It will read from STDIN and write to STDOUT.tr stands for translate.SyntaxThe syntax of tr command is:$ tr [OPTION] SET1 [SET2]TranslationIf both the SET1 and SET2 are specified and ‘-d’ OPTION is 阅读全文