linux写环境变量对字符转义

　　之前在配置oracle环境换了或者jdk环境，用脚本初始化配置，发现$JAVA_HOME被真实路径取代，这不操蛋吗，今天无意间发现echo  -e可以转义特殊字符

得之兴业，岁在今朝！

• 对oracle账户下oaclle单实例数据库变量的设置

#!/bin/bash
echo export ORACLE_BASE=/u01/app/oracle >>.bash_profile
echo -e "export ORACLE_HOME=\$ORACLE_BASE/product/12c" >>.bash_profile     //echo -e 对特殊字符转义 \$  写入到文件 $
echo export ORACLE_SID=oracle12c >>.bash_profile
echo -e "PATH=\$PATH:$HOME/bin:\$ORACLE_HOME/bin:\$ORACLE_HOME/lib:\$ORACLE_HOME/lib64" >>.bash_profile
echo -e "LD_LIBRARY_PATH=\$ORACLE_HOME/bin:/usr/bin" >>.bash_profile
echo export NLS_LANG="AMERICAN_AMERICA.ZHS16GBK" >>.bash_profile

source ~/.bash_profile   //刷新用户环境变量

• 　官方对echo解释

ECHO(1)                          User Commands                         ECHO(1)

NAME
       echo - display a line of text

SYNOPSIS
       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION
       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline   //不换行

       -e     enable interpretation of backslash escapes  //允许转义字符

• 　　Linux直接转义特殊字符

#!/bin/bash
#desc init jdk env
cat >> ~/.bash_profile<<EOF
export ABC=/tmp
export abc=\$ABC/123
EOF

//结果
[root@lab- ~]# cat .bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
    . ~/.bashrc
fi

# User specific environment and startup programs

export PATH=$PATH:$HOME/bin

export ABC=/tmp
export abc=$ABC/123