用SHELL编写的快速进入linux不同目录的程序。可记录20个目录，可选择快速进入。-SHELL prepared with quick access to different directories linux programs. It can record 20 directory, choose quick access.

检查Linux imap服务程序弱点的Unix Shell程序 -A unix shell app which can detect the weakness of Linux imap service

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this ebook contains the topi introduction to string theory which includes strings in qcd,classical strings.open & closed strings, quantizations,Lorentz invariance,Interactions and vertex operators,BRST quantization,T-DualityFermions in strings and va