cat without cat

bashcat.sh

# minimal example just for reference, not pointful by itself
# binary-safe read/write file without cp/cat/dd etc, pure bash, no subshell
 while LANG=C IFS= read -d '' -r -n 1 x ;do printf '%c' "$x" ;done <bin1 >bin2

from a comment on another gist, slightly different version that reads non-nulls contiguously instead of every single byte individually
https://gist.github.com/bkw777/ddde771cc85fdd888c7ec74953193d66?permalink_comment_id=5686772#gistcomment-5686772