1 files changed, 55 insertions, 0 deletions
diff --git a/jotpass.ksh b/jotpass.ksh
new file mode 100755
index 0000000..c1b14aa
--- /dev/null
+++ b/jotpass.ksh
@@ -0,0 +1,55 @@
+#! /bin/ksh
+
+# Copyright (c) 2021 Stefan Kreutz <mail@skreutz.com>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+alphabet=23456789abcdefghijmopqrstwxyzABCDEFGHJKLMNPQRSTUVWXYZ
+groups=12
+width=4
+separator=-
+verbosity=0
+
+while getopts :va:g:w:s: option; do
+  case "$option" in
+    v) verbosity=$((verbosity+1)) ;;
+    a) alphabet="$OPTARG" ;;
+    g) groups="$OPTARG" ;;
+    w) width="$OPTARG" ;;
+    s) separator="$OPTARG" ;;
+    :) print -u2 -- "missing argument for option -$OPTARG"; exit 1 ;;
+    ?) print -u2 -- "illegal option: -$OPTARG"; exit 1 ;;
+  esac
+done
+shift $((OPTIND-1))
+
+# shellcheck disable=SC2046
+set -A symbol -- $( echo "$alphabet" | fold -w 1 | sort -u | tr -d '\n' | sed 's/./& /g' )
+
+# shellcheck disable=SC2154
+symbols=${#symbol[*]}
+
+jot -r $((groups*width)) 0 $((symbols-1)) |
+  while IFS= read -r i; do echo "${symbol[$i]}"; done |
+  tr -d '\n' |
+  fold -w "$width" |
+  paste -s -d "$separator" -
+
+if [ $verbosity -gt 0 ]; then
+  entropy="$( printf 'e = (%d * %d * l(%d))/l(2); scale = 0; e/1\n' "$groups" "$width" "$symbols" | bc -l )"
+  print -u2 -- "The generated password has an entropy of ${entropy} bits."
+fi