linux - [: <filename>: unexpected error in shell programming

Question

我创建了一个脚本，该脚本创建两个文件并在两个文件不同时反转它们的内容。我不明白如何解决此错误:

[: my-filename: unexpected error in shell programming

代码:

echo "Enter first filename :"
read file1
echo "Enter second filename:"
read file2
echo "Enter content of file 1 : "
gedit $file1
echo "Enter content of file 2 : "
gedit $file2

check=" " 

x=` cmp $file1 $file2 `
if [ $x -eq $check ]
then
echo "Both files are same"
rm $file2
echo "Redundant file removed!!!"
else
echo "They are different"
fi

tac $file1 | cat > temp1
rev temp1 | cat > temp11 
tac $file2 | cat > temp2
rev temp2 | cat > temp22
mv temp11 $file1
mv temp22 $file2

echo "Content of both the files reversed"

Answer 1

您可以直接在 if 语句中使用 cmp

if cmp -s $file1 $file2
then
  echo "Both files are same"
  rm $file2
  echo "Redundant file removed!!!"
else
  echo "They are different"
fi