root `PATH` 的脚本更改并在重新启动时永久反映它

Question

我有一个脚本，它执行一些基本的根路径完整性检查并在~/.bash_profile 中输入一行来获取我的脚本，这样我在根PATH 中所做的更改在重新启动后是永久的：

cat path_clean
#!/bin/bash

OLD_PATH=`echo $PATH`

OIFS=$IFS
IFS=:
for path in ${OLD_PATH}; do
    [ -d "${path}" ] || continue
    paths=( "${paths[@]}" "${path}" )
done

while read -r stat owner path; do
    [ "${owner}${stat:5:1}${stat:8:1}" = 'root--' ] || continue
    newpath="${newpath}:${path}"
done < <(stat -c "%A:%U:%n" "${paths[@]}" 2>/dev/null)

IFS=${OIFS}

NEW_PATH=${newpath#:}
export PATH=${NEW_PATH}
egrep "^[ ]*if.*fi;" ~/.bash_profile &> /dev/null
if [ $? -ne 0 ];
then
   echo 'if [ -f /root/path_clean ]; then source /root/path_clean; fi;' >>     ~/.bash_profile
fi

当我第一次像这样运行脚本时，一切都按预期运行：

./path_clean
. ~/.bash_profile

但是脚本有一个问题。如果我多次执行. ~/.bash_profile，那么我会看到 PATH 变量中的值每次都会重复。

例如在执行脚本之前我的PATH 是：

[root@labeir1 ~]# echo $PATH
    /usr/bin/X11:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin

现在在第一次运行. ~/.bash_profile 之后，一切正常：

[root@labeir1 ~]# ./path_clean
[root@labeir1 ~]# echo $PATH <--still same as original `PATH`, which is ok
   /usr/bin/X11:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/root/bin
[root@labeir1 ~]# . ~/.bash_profile <--now sourcing `.bash_profile`1st time
[root@labeir1 ~]# echo $PATH <--my script has changed `PATH` fine.
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin
[root@labeir1 ~]# . ~/.bash_profile
[root@labeir1 ~]# echo $PATH <-- problem starts
    /usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin
[root@labeir1 ~]# . ~/.bash_profile
[root@labeir1 ~]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/ulticom/diameter/bin:/apps/omni/bin

请建议对脚本进行哪些更改以使其正常工作并消除此问题。

Answer 1

我的猜测是你需要在使用之前清除newpath。否则，它将保存最后一个source 命令留下的值。