bash shell脚本在两个JPG上运行imgcmp并存储“不同的”

Question

我有一台IP摄像机，可以将文件ftps文件传输到我的SuSE服务器上的某个目录。

我试图写一个shell脚本来执行以下操作：

for every file in a directory; 
    use image compare to check this file against the next one 
    store the output in a file or variable. 
    if the next file is different then 
     copy the original to another folder 
    else 
     delete the original 
end for 

运行在提示符下产生的：

myserver:/uploads # imgcmp -f img_01.jpg -F img_02.jpg -m rmse > value.txt 
myserver:/uploads # cat value.txt 
5.559730 
5.276747 
6.256132 
myserver:/uploads # 

我知道有加载错误的代码，我得到的主要问题是从脚本执行imgcmp并从中提取一个值，所以请指出显然的原因，因为它可能不适合我。

FILES=/uploads/img* 
declare -i value 
declare -i result 
value = 10 
shopt -s nullglob 
# no idea what the above even does # 
# IFS=. 
# attempt to read the floating point number from imgcmp & make it an integer 
for f in $FILES 
do 
    echo "doing stuff w/ $f" 
    imgcmp -f 4f -F 4f+1 -m rmse > value.txt 
    # doesn't seem to find the files from the variables # 
    result= ($(<value.txt)) 
    if [ $result > $value ] ; then 
    echo 'different'; 
    # and copy it off to another directory # 
    else 
    echo 'same' 
    # and delete it # 
    fi 
    if $f+1 = null; then 
    break; 
    fi 
done 

运行上面的时候

，我得到一个错误cannot open /uploads/img_023.jpg+1 和做value.txt的猫说明不了什么，所以所有的文件显示为相同。

我知道问题出在哪里，但我不知道我应该怎么做才能提取imgcmp的输出（从脚本中运行），然后将它变成一个变量，我可以将其与。

Answer 1

FILES=/uploads/* 

current= 
for f in $FILES; do 
    if [ -z "$current" ]; then 
    current="$f" 
    continue 
    fi 
    next="$f" 
    echo "<> Comparing $current against $next" 
    ## imgcmp will return non-0 if images cannot be compared 
    ## and print an explanation message to stderr; 
    if result=$(imgcmp -f $current -F $next -m rmse); then 
    echo "comparison result: " $result 
    ## Checking whether the first value returned 
    ## is greater than 10 
    if [ "$(echo "$result" | awk '$1 > 10 {print "different"}')" = "different" ]; then 
     echo 'different'; 
     # cp -v $current /some/other/folder/ 
    else 
     echo 'same' 
     # rm -v $current 
    fi 
    else 
    ## images cannot be compared... different dimensions/components/... 
    echo 'wholly different' 
    # cp -v $current /some/other/folder/ 
    fi 
    current="$next" 
done