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电梯直达

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发表于 2015-09-28 18:36 |只看该作者 |倒序浏览

各位好，
　　我在shell script中使用<<EOF...EOF导入一段原始的环境变量到/etc/bashrc的末尾，导是导过去了，不过导过去后看到的不是原始的环境变量串，而是环境变量的值，很奇怪，哪位大神帮忙解解，万分感谢！详情如下：

１. shell脚本中的代码如下：

cat >> /etc/bashrc <<EOF
export HISTORY_FILE="/var/log/history.log"
export PROMPT_COMMAND='{ thisHistID=`history 1|awk "{print\\$1}"`;lastCommand=`history 1| awk "{\\$1=\"\" ;print}"`;user=`id $(whoami)`;whoStr=(`who -u am i`);realUser=${whoStr[0]};logMonth=${whoStr[2]};logDay=${whoStr[3]};logTime=${whoStr[4]};pid=${whoStr[6]};ip=${whoStr[7]};if [ ${thisHistID}x != ${lastHistID}x ];then echo -E `date "+%Y/%m/%d %H:%M:%S"` $user$$realUser$@$ip[PID

pid][LOGIN

logMonth $logDay $logTime] --- $lastCommand ;lastHistID=$thisHistID;fi; } >> $HISTORY_FILE'
EOF

2. 再到/etc/bashrc中查看，看到一些变量已经被加上值了，我想要的是真正的原始变量

export HISTORY_FILE="/var/log/history.log"
export PROMPT_COMMAND='{ thisHistID=221;lastCommand= cat >> /etc/bashrc <<EOF;user=uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=root:system_r:unconfined_t:SystemLow-SystemHigh;whoStr=(root pts/2 2015-09-28 03:34 . 16833 (192.168.48.1));realUser=;logMonth=;logDay=;logTime=;pid=;ip=;if [ x != x ];then echo -E 2015/09/28 03:34:43 @[PID:][LOGIN: ] --- ;lastHistID=;fi; } >> '

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steve_zeng

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2楼 [报告]

发表于 2015-09-29 18:00 |只看该作者

终于测试通过, 原来是特殊符号需要用 \ 来逃避, 但不知道print和$1之前为什么需要5个\, \\\\\$1

cat >> /etc/bashrc <<EOF
export HISTORY_FILE="/var/log/history.log"
export PROMPT_COMMAND='{ thisHistID=\`history 1|awk "{print\\\\\$1}"\`;lastCommand=\`history 1| awk "{\\\\\$1=\"\" ;print}"\`;user=\`id \$(whoami)\`;whoStr=(\`who -u am i\`);realUser=\${whoStr[0]};logMonth=\${whoStr[2]};logDay=\${whoStr[3]};logTime=\${whoStr[4]};pid=\${whoStr[6]};ip=\${whoStr[7]};if [ \${thisHistID}x != \${lastHistID}x ];then echo -E \`date "+%Y/%m/%d %H:%M:%S"\` \$user$\$realUser$@\$ip[PID:\$pid][LOGIN:\$logMonth \$logDay \$logTime] --- \$lastCommand ;lastHistID=\$thisHistID;fi; } >> \$HISTORY_FILE'
EOF