How to Give Password in Shell Script

How to give password in shell script?

If you can't use ssh trust and must enter the password later on in your script, use read -s -p "Password:" USER_PASSWORD to silently read in the password. You can then export USER_PASSWORD to an expect script, avoiding it being displayed in ps:

    #!/usr/bin/expect -f
    spawn scp some.file USER@otherhost:~
    expect "assword:"
    send -- "$env(USER_PASSWORD)\r"
    expect eof

How to get a password from a shell script without echoing

Here is another way to do it:

#!/bin/bash
# Read Password
echo -n Password: 
read -s password
echo
# Run Command
echo $password

The read -s will turn off echo for you. Just replace the echo on the last line with the command you want to run.

In some shells (e.g. bash) read supports -p prompt-string which will allow the echo and read commands to be combined.

read -s -p "Password: " password

How to write bash script that enters password after the first command?

You may use expect script. You can pass arguments from cmd line. Sample code I write:

#!/usr/bin/expect

set timeout 100
set host [lindex $argv 0]
set username [lindex $argv 1]
set password [lindex $argv 2]
set command [lindex $argv 3]

spawn ssh $username@$host $command
#puts $command
expect {
    "(yes/no)?"
        {
            send "yes\n"
            expect "*assword:" { send "$password\n"}
        }
    "*assword:"
        {
            send "$password\n"
        }
    }

Using the passwd command from within a shell script

from "man 1 passwd":

   --stdin
          This option is used to indicate that passwd should read the new
          password from standard input, which can be a pipe.

So in your case

adduser "$1"
echo "$2" | passwd "$1" --stdin

[Update] a few issues were brought up in the comments:

Your passwd command may not have a --stdin option: use the chpasswd
utility instead, as suggested by ashawley.

If you use a shell other than bash, "echo" might not be a builtin command,
and the shell will call /bin/echo. This is insecure because the password
will show up in the process table and can be seen with tools like ps.

In this case, you should use another scripting language. Here is an example in Perl:

#!/usr/bin/perl -w
open my $pipe, '|chpasswd' or die "can't open pipe: $!";
print {$pipe} "$username:$password";
close $pipe

How to provide password to a command that prompts for one in bash?

Take a look at autoexpect (decent tutorial HERE). It's about as quick-and-dirty as you can get without resorting to trickery.

How to automatically add user account AND password with a Bash script?

You can run the passwd command and send it piped input. So, do something like:

echo thePassword | passwd theUsername --stdin

how to create a file in shell script with specific password

If zipping is an option for you, then you can password protect the zip file:

zip -P 1234 order.zip $dir/output/ORDER.csv

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