在.bashrc中添加路径到变量PATH中

每次执行source .bashrc会重复添加。

echo $PATH

把下面这段代码放到.bashrc文件的末尾，会删除冗余路径。

#!/bin/bash

#

# path-cleanup

#

# This must be run as "source path-cleanup" or ". path-cleanup"

# so the current shell gets the changes.

pathlist=`echo $PATH | sed 's/:/\n/g' |sort| uniq`

# echo "Starting PATH: $PATH"

# echo "pathlist: $pathlist"

unset PATH

# echo "After unset, PATH: $PATH"

for dir in $pathlist

do

   if test -d $dir ; then

       if test -z $PATH; then

           PATH=$dir

       else

           PATH=$PATH:$dir

       fi

   fi

done

export PATH

# echo "After loop, PATH: $PATH"

#### 参考

https://stackoverflow.com/questions/11650840/remove-redundant-paths-from-path-variable