possible bashism in bashisms/dynamic-length.sh line 6 (${foo:3[:1]}):
echo "${f:1}" # BASHISM
possible bashism in bashisms/dynamic-length.sh line 7 (${foo:3[:1]}):
echo "${f:$len}" # BASHISM
possible bashism in bashisms/dynamic-length.sh line 8 (${foo:3[:1]}):
echo "${f:$len$len}" # BASHISM
possible bashism in bashisms/dynamic-length.sh line 9 (${foo:3[:1]}):
echo "${f:${len}}" # BASHISM