新安装的CentOS5.5系统，在secureCRT下使用rz sz 上传下载文件时出现如下提示：
[root@webslave2 etc]# sz hosts -bash: sz: command not found [root@webslave2 etc]#
由上述现象可知，很可能没有安装相应的软件包；sz rz 命令所需要的软件包是lrzsz
下面检查软件包是否安装？
[root@webslave2 etc]# yum list installed lrzsz Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.neu.edu.cn * base: mirror.neu.edu.cn * extras: mirror.neu.edu.cn * updates: mirror.neu.edu.cn Error: No matching Packages to list 由此可知没有安装此包
[root@webslave2 etc]#
下面安装lrzsz软件包，可通过yum安装，比较方便！
先查看下载源中的软件包
[root@webslave2 etc]# yum search lrzsz Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.neu.edu.cn * base: mirror.neu.edu.cn * extras: mirror.neu.edu.cn * updates: mirror.neu.edu.cn ===================== Matched: lrzsz ========================== lrzsz.x86_64 : The lrz and lsz modem communications programs.
安装软件包（使用yum自动安装：）
[root@webslave2 etc]# yum -y install lrzsz Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.neu.edu.cn * base: mirror.neu.edu.cn * extras: mirror.neu.edu.cn * updates: mirror.neu.edu.cn Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package lrzsz.x86_64 0:0.12.20-22.1 set to be updated --> Finished Dependency Resolution Dependencies Resolved ======================================================================= Package Arch Version Repository Size ====================================================================== Installing: lrzsz x86_64 0.12.20-22.1 base 88 k Transaction Summary ======================================================================= Install 1 Package(s) Upgrade 0 Package(s) Total download size: 88 k Downloading Packages: lrzsz-0.12.20-22.1.x86_64.rpm | 88 kB 00:00 Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing : lrzsz 1/1 Installed: lrzsz.x86_64 0:0.12.20-22.1 Complete!