Linux下用sheel脚本完整实现tree功能

ubuntu下用sheel脚本完整实现tree功能，

1.1 该部分实现树形结构

这里写代码片
!/bin/bash
branch_vline="│   "     #Branch vertical line 
branch_null="    "      #null separation branch 
middle_branch_end="├── "  #middle file branch
last_branch_end="└── "    #the last file branch
branch_sum="" 
tree()  
{   
        #Define local variables, implement the number of files under each file, record the number of files, 
        #and pay attention to the location of this variable definition 
        local num=0 
        for file in *;  
        do  
        #Count the number of directory files for this file 
      thelastfile=`ls |wc -l`
      num=$((num+1))
      #When the file belongs to the last file in that directory, the output is appended to $last_branch_end 
        if [[ $thelastfile -eq $num ]]; then
                if [ -f "$file" ]; then
                    echo -e "${branch_sum}$last_branch_end$file"             
                fi
                #When the file is executable, the display file with green    
                if [ -d "$file" ]; then   
                    echo -e "${branch_sum}$last_branch_end\033[34m$file\033[0m"

                        branch_sum=${branch_sum}${branch_null}
                        cd "$file"
                        tree  
                        cd ..  
                        branch_sum=${branch_sum%${branch_null}}
                fi              
        else                
            if [ -f "$file" ]; then
                    echo "${branch_sum}${middle_branch_end}$file"                
            fi    
            if [ -d "$file" ]; then   
                    echo -e "${branch_sum}${middle_branch_end}\033[34m$file\033[0m" 
                    branch_sum=${branch_sum}${branch_vline}
                    cd "$file"  
                    tree  
                    cd ..  
                    branch_sum=${branch_sum%${branch_vline}}  
            fi              
        fi     
    done  
}  
if [ -z "$1" ]; then
    echo -e "\033[1;34m.\033[0m"
else
    echo -e "\033[1;34m$1\033[0m"
    cd $1 
fi
if [[ $? -eq 0 ]]; then
    tree
fi 

1.2 在1.1的基础上，稍作改进，将文件的属性在树形结构上用颜色体现，高仿tree功能

这里写代码片
#!/bin/bash
#sheel脚本语言实现tree功能，增加文件的颜色属性,增加文件统计

branch_vline="│   "     #Branch vertical line 
branch_null="    "      #null separation branch 
middle_branch_end="├── "  #middle file branch
last_branch_end="└── "    #the last file branch
branch_sum="" 
filecount=0
directorycount=0
tree()  
{   
    #Define local variables, implement the number of files under each file, record the number of files, 
    #and pay attention to the location of this variable definition 
    local num=0 
    for file in *;  
    do  
        #Count the number of directory files for this file 
        thelastfile=`ls |wc -l`
        num=$((num+1))
        #When the file belongs to the last file in that directory, the output is appended to $last_branch_end 
        if [[ $thelastfile -eq $num ]]; then
                if [ -f "$file" ]; then
                    filecount=$((filecount+1))
                    #When the file is executable, the display file with green
                    if [ -x "$file" ];then
                        echo -e "${branch_sum}$last_branch_end\033[1;32m$file\033[0m"
                    else
                        echo -e "${branch_sum}$last_branch_end$file"
                    fi
                fi    
                if [ -d "$file" ]; then
                    directorycount=$((directorycount+1))   
                    echo -e "${branch_sum}$last_branch_end\033[1;34m$file\033[0m"
                    branch_sum=${branch_sum}${branch_null}
                    cd "$file"
                    tree  
                    cd ..  
                    branch_sum=${branch_sum%${branch_null}}
                fi              
        else                
            if [ -f "$file" ]; then
                    filecount=$((filecount+1))
                    if [ -x "$file" ];then
                        echo -e "${branch_sum}$middle_branch_end\033[1;32m$file\033[0m"
                    else
                        echo "${branch_sum}${middle_branch_end}$file"
                    fi                       
            fi    
            if [ -d "$file" ]; then 
                    directorycount=$((directorycount+1))   
                    echo -e "${branch_sum}${middle_branch_end}\033[1;34m$file\033[0m" 
                    branch_sum=${branch_sum}${branch_vline}
                    cd "$file"  
                    tree  
                    cd ..  
                    branch_sum=${branch_sum%${branch_vline}}  
            fi              
        fi     
    done  
} 

if [ -z "$1" ]; then
    echo -e "\033[1;34m.\033[0m"
else
    echo -e "\033[1;34m$1\033[0m"
    cd $1 
fi
if [[ $? -eq 0 ]]; then
    tree
    echo
    echo "$directorycount directories,  $filecount files"
fi

上述1.2代码运行结果如下：
(左侧为Linux下tree功能，右侧为1.2脚本程序运行，分别运行带参数以及不带参数的两种情况)：