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WikiPedia: Echo_(lệnh) http://www.flexusergroup.com/flexusergroup/pdfs/sw... http://software.intel.com/en-us/articles/efi-shell... http://www.jatomes.com/Help/Os2Bat.php#ECHO http://www.teamnaconsulting.com/compresources/pdfs... http://www.in-ulm.de/~mascheck/various/echo+printf... http://www.cs.dartmouth.edu/~doug/reader.pdf http://zsh.sourceforge.net/Doc/Release/Shell-Built... http://archive.org/details/1988-rugheimer-spanik-a... http://www.bitsavers.org/pdf/digitalResearch/flexo... http://man.cat-v.org/inferno/1/echo