摘要:
Virtual Memory and Memory Mapping Virtual memory was introduced in 1959. The main goal was to significantly simplify programming by abstracting the qu... 阅读全文
摘要:
原文:http://www.thegeekstuff.com/2012/12/linux-tr-command/tr 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 阅读全文