script命令是Linux命令中比较少用的命令。其作用是将会话终端的过程录制下来，然后可以用scriptreplay命令重新演示被他人看。所以script和scriptreplay两个命令是一起使用的。
script命令参数：
[root@localhost ~]# script --help
Usage:
script [options] [file]
Options:
-a, --append append the output
-c, --command <command> run command rather than interactive shell
-e, --return return exit code of the child process
-f, --flush run flush after each write
--force use output file even when it is a link
-q, --quiet be quiet
-t, --timing[=<file>] output timing data to stderr (or to FILE)
-V, --version output version information and exit
-h, --help display this help and exit
scriptreplay命令参数：
[root@localhost ~]# scriptreplay --help
Usage:
scriptreplay [-t] timingfile [typescript] [divisor]
Options:
-t, --timing <file> script timing output file
-s, --typescript <file> script terminal session output file
-d, --divisor <num> speed up or slow down execution with time divisor
-V, --version output version information and exit
-h, --help display this help and exit
用法：
1、script -t 2>zty.log -a output.session
scriptreplay zty.log output.session
注：2>=>>,意思是stderr重定向到zty.log文件
zty.log是存储时序信息的文件
output.session是存储命令信息输出的文件
