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  • If echo "$contentlength" works, there is no reason echo "$contentlength bytes" does not work as well. Commented Mar 14, 2019 at 9:32
  • 2
    Could be the value of the variable ends in a CR character (line delimiters in HTTP headers are CRLF), 12345\r bytes would show up as " bytes" in a terminal as CR moves the cursor to the beginning of the line. Commented Mar 14, 2019 at 9:34
  • @StéphaneChazelas You're right. CR does not have this behavior when redirected. One can redirect the output and examine the result. Commented Mar 14, 2019 at 9:36
  • echo " $contentlength bytes" it returns this: ``` bytes``` Commented Mar 14, 2019 at 9:38
  • The way it's written (not proper header parsing, no sanitisation of the content length), this script has an arbitrary command injection vulnerability. Do not use a shell for this kind of thing. perl/python have HTTP or libcurl APIs. Commented Mar 14, 2019 at 9:38