Sys Admin

Zip is a compression and file packaging utility for Unix. This utility is installed by default on most Linux computers. he program is useful for packaging a set of files for distribution; for archiving files; and for saving disk space by temporarily compressing unused files or directories. To zip directory called MyDir in your home directory (/home/MyDir), type the following command: $ zip -r mydir.zip /home/MyDir

SSH login without password Aim: You want to use Linux and OpenSSH to automize your tasks. Therefore you need an  automatic  login from host A / user a to Host B / user b. You don't want to enter any passwords, because you want to call  ssh  from a within a shell script. How to do it: First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase: a@A:~> ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/a/.ssh/id_rsa): Created directory '/home/a/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/a/.ssh/id_rsa. Your public key has been saved in /home/a/.ssh/id_rsa.pub. The key fingerprint is: 3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A Now use  ssh  to create a directory  ~/.ssh  as user b on B. (The directory may already exist, which is fine): a@A:~> ssh b@B mkdir -p .ssh b@B's pa