Understand Bash scripting encryption Post: 302236004

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

File encryption/Key encryption ????

My dilemma, I need to send, deemed confidential, information via e-mail (SMTP). This information is sitting as a file on AIX. Typically I can send this data as a e-mail attachment via what we term a "mail filter" using telnet. I now would like to somehow encrypt the data and send it to a e-mail...

2. Shell Programming and Scripting

bash shell: 'exec', 'eval', 'source' - looking for help to understand

Hi, experts. Whould anybody clear explay me difference and usage of these 3 commands (particulary in bash) : exec eval source I've tryed to read the manual pages but did not get much. Also could not get something useful from Google search - just so much and so not exactly, that is...

3. Shell Programming and Scripting

I want to understand bash better

Hi everyone, I have some questions regarding bash and my initializer files: when I look at my bashrc file, I see lots of "export".. export MAGICK_HOME="$HOME/bin..etc".. what does export really mean? in my bashrc, I have a line: "umask 0002" ... what does that do? I have a bash_profile...

4. Shell Programming and Scripting

Do not understand why my while loop fail (bash)

Hi again :) I still need your help now... #!/bin/bash SIZE=`ls -s text.txt` while do done My problem is that the line "while ..." still print the same value after the first loop. In one instruction change the size of text.txt I've run my bash script in debug mode, and the...

5. UNIX for Dummies Questions & Answers

Another Simple BASH command I don't understand. Help?

I have a text file called file1 which contains the text: "ls -l" When I enter this command: bash < file1 > file1 file1 gets erased. However if I enter this command: bash < file1 > newfile the output from "ls -l" is stored in newfile. My question is why doesn't file1's text ("ls -l") get...

6. Shell Programming and Scripting

Learning curve to understand bash iteration

Hi Folks, I know on one side there is script and on another side there is smart script. I am able to achieve what I got but thought there has to be a code which doesn't require multiple lines. So if you guys can help me out than it will be awesome. Also I wrote in cshell but if can get both the...

7. Cybersecurity

File encryption tools with MAC address as an encryption key

Hi all, I'm looking for secure file encryption tools that use MAC address as encryption key. FYI, I'm using Red Hat Enterprise Linux OS. For example: when A wants to send file to B A will encrypt the file with B's computer MAC/IP address as an encryption key This file can only be decrypted...

8. Shell Programming and Scripting

I am learning shell scripting and i would like to understand how sort -k3,3 -k 4,4 short* works

Please help me understand how sort -k3,3 -k 4,4 short* works , is it sorting 3 and 4 th field ? what is the use of specifying 3,3 and 4,4 in sort and what is actually does and i see sort -k3 short* and sort -k3,3 -k 4,4 short* giving the same output. Sort output attached Please help

9. Shell Programming and Scripting

How to understand special character for line reading in bash shell?

I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters...

LEARN ABOUT OSF1

learn

learn(1)						      General Commands Manual							  learn(1)

NAME

       learn - Provides computer-aided instruction for the C shell

SYNOPSIS

       learn [-directory] [subject] [lesson]

       The learn command provides computer-aided instruction courses and practice in the use of Tru64 UNIX.

OPTIONS

       Allows you to exercise a script in a nonstandard place.

DESCRIPTION

       To  get	started,  enter learn; if this is the first time that you are invoking the learn command, you are guided through a series of ques-
       tions to determine what type of instruction you want to receive.

       If you have used learn before and left your last session without completing a subject, the program uses information  in	$HOME/.learnrc	to
       start you up in the same place you left off.

       To  bypass questions, enter a subject or lesson.  In order to enter a lesson, you must know the lesson number that you received in a previ-
       ous learn command session. If you do not know the lesson number, enter the lesson number as a subject.  The learn command searches for  the
       first  lesson  containing  the subject you specified. If the lesson is a - (dash), learn prompts for each lesson; this is useful for debug-
       ging.

       You can specify the following subjects:

       files editor vi morefiles macros eqn C

SUBCOMMANDS

       There are a few special commands.  The bye command terminates a learn session, and the where command tells you of your  progress  (where  m
       tells  you more.)  The again command redisplays the text of the lesson and again lesson lets you review lesson. The hint command prints the
       last part of the lesson script used to evaluate a response, while hint m prints the entire lesson script.  This	is  useful  for  debugging
       lessons and might possibly give you an idea about what is expected.

EXAMPLES

       To take the online lesson about files, enter: learn files

       You are then prompted for further input.

FILES

       Playpen directories.  Start-up information.

SEE ALSO

       Commands:  csh(1), ex(1)

																	  learn(1)