15.LSB

1. Unix
   SVID: AT&T UNIX System V Interface Definition
   POSIX: Portable Operating System Interface
   BSD

2. LSB: Linux Standard Base

The set -A syntax to assign values to an works in all versions of ksh. You only need to use the alternate typeset -a syntax if you run your script under bash. The easiest solution would be to always run your code under ksh. All your platforms have ksh93, so just use that: on Linux, install the ksh package and use it instead of bash. Under ksh93, you can also use a=(aModeTrace false false false false); this also works in bash but not in ksh88 (AIX’s ksh is ksh88 but there is also aksh93`).
If you absolutely need a script that’s portable between ksh88 and bash, you can put the evalhackery in functions. Only whole array assignment needs to be wrapped in this way, the syntax for access to individual elements, array size and individual element assignment is the same. Use the shell, rather than the operating system, to choose the implementation.

set_array ARRAY ELEMENT0 ELEMENT1 …

Set the variable ARRAY to contain the specified elements. Like

ARRAY=(ELEMENT0 ELEMENT1 …), but also supply a method that works in ksh88.

if [[ -n $BASH_VERSION ]]; then eval ‘

set_array () { eval “shift; $1=(\”\$@\”)”; }’
else eval ‘

set_array () { typeset __set_array_var=$1; shift

set -A $__set_array_var -- "$@"

}’
fi

1. /etc下重要的配置
   fstab
   hosts
   inittab
   mtab 当前挂载的文件系统列表
   services TCP/IP服务和它们的端口服务
   shells 系统支持的shell
   sudoers
   login.defs useradd创建新账号，读取该文件

2. 日志文件/var/log
   boot.log
   messages 系统日志
   secure 安全日志，包含用户登录等

3. sudo
   sysomc ALL=(root,oracle) NOPASSWD:/bin/su,/home/sysomc/tools/vmp/tmp/params.sh,/home/mttoolserv/bin/MTtoolDaemon.sh -
   sysomc ALL=(root,oracle) NOPASSWD: ALL
   sysomc ALL=(ALL) NOPASSWD: ALL

scu ALL=(root) NOPASSWD:/usr/sbin/useradd,/usr/sbin/userdel

1. socket