headers=`curl -I ${url} > headers` contentlength=`cat headers | grep -E '[Cc]ontent-[Ll]ength:' | sed 's/[Cc]ontent-[Ll]ength:[ ]*//g'` echo "$(($contentlength/9))"
It's getting below error:
/9")syntax error: invalid arithmetic operator (error token is "
HTTP headers always end with CR/LF, not just LF; your `cat headers | ...` command expansion will remove the ending LF, but leave the CR alone, which will cause that strange error.
% var=`printf "%s\r\n" 333`
% echo var={$var}
}ar={333
% echo "$((var / 3))"
")syntax error: invalid arithmetic operator (error token is "
