在.sh文件中使用代码时替换错误

Question

This script is to post in my Facebook page with Reddit post. I got error in this line:

SUBJECT=$(wget -qO- "${PICTURE::-4}" | perl -l -0777 -ne 'print $1 if /<title.*?>\s*(.*?)(?: - Imgur)?\s*<\/title/si')

Answer 1

You appear to be using a non-POSIX feature in a shell that does not support it. (Likely, you are using dash instead of bash .) Try replacing

${PICTURE::-4}

with

${PICTURE%????}