shell script
shell script (application/x-shellscript)
参考：Shell 教程
Shell 是一个用 C 语言编写的程序，它是用户使用 Linux 的桥梁。Shell 既是一种命令语言，又是一种程序设计语言。
Shell 是指一种应用程序，这个应用程序提供了一个界面，用户通过这个界面访问操作系统内核的服务。
Ken Thompson 的 sh 是第一种 Unix Shell，Windows Explorer 是一个典型的图形界面 Shell。
Shell 脚本（shell script），是一种为 shell 编写的脚本程序。
业界所说的 shell 通常都是指 shell 脚本，但读者朋友要知道，shell 和 shell script 是两个不同的概念。
由于习惯的原因，简洁起见，本文出现的 “shell编程” 都是指 shell 脚本编程，不是指开发 shell 自身。
1、确认Linux 的 Shell 种类众多，常见的有：Bourne Again Shell（/bin/bash） ，由于易用和免费，Bash 在日常工作中被广泛使用。同时，Bash 也是大多数Linux 系统默认的 Shell。
2、CDS的电路图捕获，仿真，版图和验证
3、设置LISCENCE,减少检索时间
4、仿真入口
5、CDS中一些会被使用的变量：64位
对于一个cadence IC来说，他和一个工艺库建立连接的方式便是通过一个cds.lib的数据进行指引。所以cds.lib本质上来说，只是一个包含库路径的数据引导文本。
6、设置在系统路径之前。
#!/bin/bash -e
############################################################################
# Cadence Design Systmes
#
# Master IC CAD flow including schematic capture, simulation, layout,
# and verification.
############################################################################
export CADHOME=/EDA/cadence/
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Set up either CDS_LIC_FILE or LM_LICENSE_FILE, but not both or it'll
# take long time to search license.
#
# export CDS_LIC_FILE=port@hostname
# This varialbe should be consistent with the 1st line in the license.dat
# Run "hostname" or "uname -n" on terminal to get your hostname
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
export CDS_LIC_FILE=/EDA/cadence/IC616/share/license/license.dat
# Requied for Cadence on Linux
export LANG=C
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Cadence - IC
#
# IC Schematic Entry, Simulation, Layout, Verification (Diva)
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
export CDS=$CADHOME/IC616
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Some of these variables are used by various other tools.
# Set them to be safe
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
export CDSDIR=$CDS
export CDSHOME=$CDS
export CADENCE_DIR=$CDS
export CDS_INST_DIR=$CDS
# Set Spectre defauts and netlisting mode
#export SPECTRE_DEFAULTS=-E
export CDS_Netlisting_Mode=Analog
# This environment variable enables Spectre HB
export CDS_SPECTRERF_FBENABLE=1
# Turn on the Palette feature. LSW no longer works, but many new features available
#export CDS_USE_PALETTE
# Support for 64-bit executables (this should be set for 64-bit hosts)
export CDS_AUTO_64BIT=ALL
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Master IC PATH
#
# Set it before system PATH
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
export PAT
Linux export 命令用于设置或显示环境变量。
在 shell 中执行程序时，shell 会提供一组环境变量。export 可新增，修改或删除环境变量，供后续执行的程序使用。export 的效力仅限于该次登陆操作。
export [-fnp][变量名称]=[变量设置值]
列出环境变量
# export -p //列出当前的环境变量值
declare -x HOME=“/root“
declare -x LANG=“zh_CN.UTF-8“
declare -x LANGUAGE=“zh_CN:zh“
declare -x LESSCLOSE=“/usr/bin/lesspipe %s %s“
declare -x LESSOPEN=“| /usr/bin/lesspipe %s“
declare -x LOGNAME=“root“
declare -x LS_COLORS=““
declare -x MAIL=“/var/mail/root“
declare -x OLDPWD
declare -x PATH=“/opt/toolchains/arm920t-eabi/bin:/opt/toolchains/arm920t-eabi/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games“
declare -x PWD=“/root“
declare -x SHELL=“/bin/bash“
declare -x SHLVL=“1“
declare -x SPEECHD_PORT=“6560“
declare -x SSH_CLIENT=“192.168.1.65 1674 22“
declare -x SSH_CONNECTION=“192.168.1.65 1674 192.168.1.3 22“
declare -x SSH_TTY=“/dev/pts/2“
declare -x TERM=“XTERM“
declare -x USER=“root“
declare -x XDG_SESSION_COOKIE=“93b5d3d03e032c0cf892a4474bebda9f-1273864738.954257-340206484“
