Skip to main content

shell random string

Goal

Generate a random string picked from a pattern

Recipe

Build the pattern, the random letter will be taken from it.
 export ALPHABET="azertyuiopqsdfghjklmwxcvbn"; 
The length of the string
 mihamina@pbmiha:~$ echo ${#ALPHABET} 26 
Generate a random RANK to pick
 RANK=$(($RANDOM % ${#ALPHABET})) 
Pick one random letter fro the pattern
 RANK=$(($RANDOM % ${#ALPHABET})); echo ${ALPHABET:$RANK:1} 
Build a 20 characters long random string from the pattern
 RANDSTRING="";  for I in $(seq 1 20) do   RANK=$(($RANDOM % ${#ALPHABET}));    RANDSTRING=${ALPHABET:$RANK:1}${RANDSTRING};  done;  echo $RANDSTRING 
Make a function to summarize it
 function random_string () {     ALPHABET="azertyuiopqsdfghjklmwxcvbn";         RANDSTRING="";      for I in $(seq 1 $1)     do         RANK=$(($RANDOM % ${#ALPHABET}));          RANDSTRING=${ALPHABET:$RANK:1}${RANDSTRING};      done;  } random_string 3 ; echo $RANDSTRING random_string 5 ; echo $RANDSTRING random_string 15; echo $RANDSTRING 

Popular posts from this blog

npm run build base-href

Using NPM to specify base-href When building an Angular application, people usually use "ng" and pass arguments to that invocation. Typically, when wanting to hard code "base-href" in "index.html", one will issue: ng build --base-href='https://ngx.rktmb.org/foo' I used to build my angular apps through Bamboo or Jenkins and they have a "npm" plugin. I got the habit to build the application with "npm run build" before deploying it. But the development team once asked me to set the "--base-href='https://ngx.rktmb.org/foo'" parameter. npm run build --base-href='https://ngx.rktmb.org/foo did not set the base href in indext.html After looking for a while, I found https://github.com/angular/angular-cli/issues/13560 where it says: You need to use −− to pass arguments to npm scripts. This did the job! The command to issue is then: npm run build -- --base-href='https://ngx.rktmb.org/foo&

Jenkins invalid privatekey

Publish over SSH, Message "invalid privatekey:" With quite recent (June-July 2020) installations of Jenkins and OpenSSH, I have the following error message when using the "Deploy overs SSH" Jenkins plug-in and publishing artifacts to the target overs SSH: jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key. Message [invalid privatekey: [B@d8d395a] This problem seems to be referenced here: https://issues.jenkins-ci.org/browse/JENKINS-57495 Just regenerate a key with the right parameters To solve it: ssh-keygen -t rsa -b 4096 Or ssh-keygen -t rsa -b 4096 -m PEM

AzureCLI Custom Python

Installing Azure CLI on Archlinux When trying to install Azure CLI on Archlinux, I follow the documentation, in the "script" tab , and it leads to the following errors: [mihamina@arch-00 ~]$ curl -L https://aka.ms/InstallAzureCli | bash [...] Running install script. -- Verifying Python version. -- Python version 3.11.3 okay. [...] -- Executing: ['/usr/bin/python3', 'virtualenv.py', '--python', '/usr/bin/python3', '/home/mihamina/lib/azure-cli'] /tmp/tmpn0w4l6w9/virtualenv-16.7.11/virtualenv.py:24: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives import distutils.spawn /tmp/tmpn0w4l6w9/virtualenv-16.7.11/virtualenv.py:25: DeprecationWarning: The distutils.sysconfig module is deprecated, use sysconfig instead import distutils.sysconfig Already using interpreter /u