How to write a script for text file encryption?

Shell Programming and Scripting
1

Hi All,

I have zero knowledge in UNIX, so i desperately need the help from you guys.

I need a script which can encrypt all the text files in one shot in a source directory.
After all the text files are encrypted, they will be put into a separate folder.

Command involve:
gpg with -a, --armor

eg.
Before encyption:
/main/project/sorce/file1.txt
/main/project/sorce/file2.txt
/main/project/sorce/file3.txt

Before encyption:
/main/project/target/file1.txt.gpg
/main/project/target/file2.txt.gpg
/main/project/target/file3.txt.gpg

2

You can process multiple files with the following option to gpg:

gpg -r "somename" --encrypt-files `ls /main/project/sorce/*.txt`

once you get the *.gpg files move them

mv /main/project/sorce/*.gpg /main/project/target/

If you want you can put the above 2 commands into a file and make it into a shell script, but not needed.

3

Thanks.

How to make it into shell script?
Is there any script that is able to automatically encypt whenever there are new txt files are dropped into the /source folder?

Please advise.

4

Sample code - the script handles one file at a time.
Enhance it for your need.

#!/bin/bash
#Script Name : encrypt.sh
#run the script in the background and forget about it i.e. ./encrypt.sh &
old_file_count=0
while true; do
  curr_file_count=`ls | wc -l`
  if [ $curr_file_count -gt $old_file_count ]; then
    old_file_count=$curr_file_count
    new_file=`ls -rt | tail -1`
    echo "New file found : $new_file : do whatever you want now"
    #gpg -r $new_file.gpg --encrypt-files $new_file
    #mv $new_file.gpg /where/ever/you/want
  fi
  #Change the sleep timer to your need
  sleep 5
done

You can also add this as a cronjob with necessary changes.

--ahamed

5

The following is our manual command to encypt those txt files in source folder:
gpg --verbose --armour --encrypt --recipient "IMS_L2" --output Jan_Payment.pgp Jan_Payment.txt

How can I integrate it into the new shell script?

6 
...
gpg --verbose --armour --encrypt --recipient "IMS_L2" --output $new_file.pgp $new_file.txt
...

Like this?

--ahamed

7

Im testing this code in a development environment.
As far as i know, in the production it need a public key to do the encryption.
Where can i find the public key?
Is this the public key "IMS_L2"?

---------- Post updated at 07:32 AM ---------- Previous update was at 07:27 AM ----------

"

gpg :encryption of 'ls /home/taurus/project/source/*.txt failed:public key not found

"
This is one of the msg I encountered,