#!/usr/bin/env bash
# randpass.sh
# Generate semi-aleatory passwords from command line.
# Usage:
# ./randpass.sh  [NN]
# "NN" is an optional positive integer.
# Default length: 20

if [ -z "$1" ]
then
   LEN=20
else
   LEN=$1
fi

echo $(< /dev/urandom  tr -cd 'a-zA-Z0-9\<>!".$%&/()=?|@#[]{}-_.:,' \
| head -c $LEN)

Example:

$ randpass.sh 32

R"}I3$XzdsC0@KnjjA&U"M4$"lRLkIB@


$ for i in {1..10}; do randpass.sh; done

H,Cqby/2345UgyLWej5k

YV@{N{D<Tb<AtoqEa6t<

iz)!CL,y=(f/6!|3]8d=

Cjx09BT|?)W}_#q:KI(t

V](cO_1F]$Iq@h!2A"]]

PSO-2lp#>/FI=0DfSI]k

e?PrxzL_Q)ZcXr.YdOpr

ZLDU|x9kLmIcD-tEC9{t

|MD.VV)jck3B:9QR&mkG

1/bg&Iy?skZL9EMUxi3)

randpass.sh: Generate semi-aleatory passwords from command line.

Bash