root `PATH` 的脚本更改并在重新启动后永久反映它

Question

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

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

当我第一次运行脚本时，一切运行都符合预期：

./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 变量中的值每次都在重复。

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

现在在运行ning . ~/.bash_profile 第一次之后，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

我的猜测是您需要先清除 newpath 才能使用它。否则，它将保留最后一个 source 命令留下的值。

root `PATH` 的脚本更改并在重新启动后永久反映它

script for root `PATH` changes and reflect it permanently across reboots

linux

bash

path

environment-variables