检查文件内容是否相同

Question

我有很多.txt文件（即1.txt，2.txt 3.txt ...等）保存在一个目录中，我想检查里面的文件内容目录是否相同

所有文件都应该与其他文件进行比较，如果内容相同则打印是，如果内容不同则打印否

例如： 1.txt

a
b
c

2.txt

a
b
c

3.txt

1
2
3


expected output when compare two file 1.txt 2.txt

1.txt 2.txt yes

expected output when compare two file 1.txt 3.txt
1.txt 3.txt no

expected output when compare two file 2.txt 3.txt
    2.txt 3.txt no

我试过脚本

#!/bin/sh
for file in /home/nir/dat/*.txt
do
echo $file
diff $file $file+1
done

但这里的问题是它没有给出 output.Please 建议更好的解决方案，谢谢。

Answer 1

bash 中的类似内容：

for i in *
do 
  for j in *
  do 
    if [[ "$i" < "$j" ]]
    then 
      if cmp -s "$i" "$j"
      then 
        echo $i $j equal
      else 
        echo $i $j differ
      fi
    fi
  done
done

输出：

1.txt 2.txt equal
1.txt 3.txt differ
2.txt 3.txt differ

Answer 2

使用文件名数组并借用 jamesbrown 的 cmp 解决方案的一个想法：

# load list of files into array flist[]

flist=(*)

# iterate through all combinations; '${#flist[@]}' ==> number of elements in array

for ((i=0; i<${#flist[@]}; i++))
do
    for ((j=i+1; j<${#flist[@]}; j++))
    do
         # default status = "no" (ie, are files the same?)

         status=no

         # if files are different this generates a return code of 1 (aka true),
         # so the follow-on assignment (status=yes) is executed

         cmp -s "${flist[${i}]}" "${flist[${j}]}" && status=yes

         echo "${flist[${i}]} ${flist[${j}]} ${status}"
    done
done

对于问题中列出的 3 个文件，这会生成：

1.txt 2.txt yes
1.txt 3.txt no
2.txt 3.txt no

检查文件内容是否相同

check the content of the files if they are same

bash

for-loop

diff