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add.sh

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+add() {
+dc -e "$1 $2 + p"
+#extra version
+#dc -e "$1 $2 + 2 / p"
+}

byte2dec.sh

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+byte2dec() {
+ printf "%s" "$1"|
+ od -A n -t d1|
+ tr -s "[:blank:]" "\n"|
+ tail -n +2|
+ while read i;do
+  echo "$i"|
+  awk '/^[^-]/{printf("%03d ", $0);};\
+       /^-/{print 256-substr($1,2)}'|
+  tr "[:space:]" " ";
+ done
+}

count_bytes.sh

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+count_bytes() {
+ printf "%s" "$1"|od -A n -t x1|
+ tr -s "[:space:]"|
+ sed -e "1s/[[:space:]]//"\
+     -e "s/.../&\n/g"|
+ tr  -s "[:space:]"|
+ wc -l
+}

dec2byte.sh

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+dec2byte() {
+ printf "%s" "$1"|
+ tr " " "\n"|
+ while read i;do
+  echo "8 o $i p"|dc|
+  while read j;do
+   printf "\\$j";
+  done;
+ done;
+ echo
+}

gen_sheet.sh

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+gen_sheet0() {
+ n="${1:-8}"
+ n="$(expr "$n" "*" "4")"                 #  ↓↓↓ octal
+ grep -o "[[:digit:]]" -a /dev/urandom|grep [0-7]|
+ head -n "$n"|
+ tr -d "\n"|
+ sed -e "s/..../&\n/g";
+ echo;
+}
+gen_sheet() {
+gen_sheet0 "$1"|tr -s "[:space:]"|tee sheet.txt
+}