PATH变量重复

命令：

export PATH=$(echo $PATH | tr : "\n"| sort | uniq | tr "\n" :)

---

Code：

awk -F: '{
sep = ""
for (i = 1; i <= NF; ++i)
    if (unique[$i] != 1)
    {
        ut = out sep $i
        sep = ":"
        unique[$i] = 1
    }
print out
}' < < < $PATH