思路：
1、如何获得目录下的文件
2、如何批量获得目录下的文件
3、如何区分获得的文件
4、如何在区分后，统计文件数
5、如何汇总文件数
6、变量处理，按照脚本规范原则，对于脚本中出现的特定数值一律通过全局变量来定义，对于特定的字符或字符串变量也一律用全局变量来定义
7、汇总脚本
下面一层层来解决
- 如何获得目录下的文件
ls /etc
ls /var
ls /usr
- 如何批量获得目录下的文件
cd /etc
for etc_file in $(ls)
do
...
done
cd /var
for var_file in $(ls)
do
...
done
cd /usr
for usr_file in $(ls)
do
...
done
- 如何区分获得的文件
[ -d $etc_file ]
[ -d $var_file ]
[ -d $usr_file ]
- 如何在区分后，统计文件数
etc_dir_num=0
etc_file_num=0
for etc_file in $(ls)
do
[ -d $etc_file ] && ((etc_dir_num+=1)) || ((etc_file_num+=1))
done
var_dir_num=0
var_file_num=0
cd /var
for var_file in $(ls)
do
[ -d $var_file ] && ((var_dir_num+=1)) || ((var_file_num+=1))
done
usr_dir_num=0
usr_file_num=0
cd /usr
for usr_file in $(ls)
do
[ -d $usr_file ] && ((usr_dir_num+=1)) || ((usr_file_num+=1))
done
- 如何汇总文件数
allfile=$((${$etc_file_num}+${var_file_num}+${usr_file_num}))
alldir=$((${$etc_dir_num}+${var_dir_num}+${usr_dir_num}))
echo “There are ${allfile} files and ${alldir} dirs.”
-
变量处理，按照脚本规范原则，对于脚本中出现的特定数值一律通过全局变量来定义，对于特定的字符或字符串变量也一律用全局变量来定义
declare -i etc_dir_num var_dir_num usr_dir_num declare -i etc_file_num var_file_num usr_file_num
etc_dir_num=0 var_dir_num=0 usr_dir_num=0 etc_file_num=0 var_file_num=0 usr_file_num=0 -
汇总脚本
#!/bin/bash
jisuan () {
cd $dira
for a_file in $(ls)
do
[ -d $a_file ] && ((a_dir_num+=1)) || ((a_file_num+=1))
done
cd $dirb
for b_file in $(ls)
do
[ -d $b_file ] && ((b_dir_num+=1)) || ((b_file_num+=1))
done
cd $dirc
for c_file in $(ls)
do
[ -d $c_file ] && ((c_dir_num+=1)) || ((c_file_num+=1))
done
}
[ $# -ne 3 ] && { echo "Usage: $(basename $0) need three arguments.";exit -1; }
declare -i a_file_num b_file_num c_file_num a_dir_num b_dir_num c_dir_num
a_dir_num=0
b_dir_num=0
c_dir_num=0
a_file_num=0
b_file_num=0
c_file_num=0
dira=$1
dirb=$2
dirc=$3
jisuan
allfile=$((a_file_num+b_file_num+c_file_num))
alldir=$((a_dir_num+b_dir_num+c_dir_num))
echo "There are ${allfile} files and ${alldir} dirs."