The Unix Shell The Secure Shell Copyright Software

$ pwd /users/vlad $ shell Unix Shell Secure Shell

login as: vlad Password: **** shell Unix Shell Secure Shell

login as: vlad Password: **** moon> shell remote shell Unix Shell Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: Unix Shell Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: *** Access denied Password: Unix Shell Secure

$ pwd /users/vlad $ ssh vlad@moon Password: *** Access denied Password: **** moon> pwd

$ ssh vlad@moon Password: **** moon> pwd /home/vlad moon> ls -F bin/ cheese. txt

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad source file. . . Unix Shell Secure

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad source file. . . …to destination directory

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad Password: **** cheese. txt 100% 9 1.

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad $ scp -r vlad@moon: /home/vlad/dark_side vlad@earth: /users/vlad

$ scp -r vlad@moon: /home/vlad/dark_side vlad@earth: /users/vlad $ scp -r vlad@moon: /home/vlad/dark_side /users/vlad $

$ ssh vlad@moon Password: **** moon> df –h Filesystem Size Used /dev/sda 1 7.

$ ssh vlad@moon 'df Password: **** Filesystem Size /dev/sda 1 7. 9 G /dev/sda

character stream $ echo "open sesame, please" | vlad@moon 'cat > magic. txt' Password:

before $ ssh vlad@moon 'ls –F /home/vlad' Password: **** bin/ cheese. txt dark_side/ rocks.

login as: vlad Password: **** shell remote shell Unix Shell Secure Shell

login as: vlad Password: thriller shell remote shell Unix Shell Secure Shell

shell remote shell Unix Shell Secure Shell

public key cannot decrypt using public key encryption using private key (only 1 copy)

login as: vlad Password: ***** huxyo ew: xdvw uqfcmjbn: lhiujdbj shell remote shell Unix

$ ssh vlad@moon The authenticity of host ‘moon (10. 1. 2. 3)‘ can't be

while true: . . . if time. mins == 30: ssh vlad@moon 'df –h'

user key pair 2 user key pair 1 Unix Shell host key pair only

$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to

$ ssh vlad@moon Enter passphrase for key '/users/vlad/. ssh/id_rsa': **** moon> Unix Shell Secure

$ scp ~/. ssh/id_rsa. pub vlad@moon Password: **** $ ssh vlad@moon Password: **** moon>

$ ssh vlad@moon> while true: . . . if time. mins == 30: ssh

created by Elango Cheran February 2011 Copyright © Software Carpentry 2011 This work is

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The Unix Shell The Secure Shell Copyright © Software Carpentry 2011 This work is licensed under the Creative Commons Attribution License See http: //software-carpentry. org/license. html for more information.

$ pwd shell Unix Shell Secure Shell

$ pwd /users/vlad $ shell Unix Shell Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: Unix Shell Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: *** Access denied Password: Unix Shell Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: *** Access denied Password: **** moon> pwd /home/vlad moon> ls -F bin/ cheese. txt Unix Shell dark_side/ rocks. cfg Secure Shell

$ pwd /users/vlad $ ssh vlad@moon Password: *** Access denied Password: **** moon> pwd /home/vlad moon> ls -F bin/ cheese. txt moon> exit $ pwd /users/vlad Unix Shell dark_side/ rocks. cfg Secure Shell

$ ssh vlad@moon Password: **** moon> pwd /home/vlad moon> ls -F bin/ cheese. txt moon> exit $ pwd /users/vlad $ ls -F bin/ notes. txt solar. pdf Unix Shell data/ papers/ swc/ dark_side/ mail/ pizza. cfg rocks. cfg music/ solar/ Secure Shell

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad source file. . . Unix Shell Secure Shell

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad source file. . . …to destination directory Unix Shell Secure Shell

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad source file. . . …to destination directory source and destination are written as user@computer: path Unix Shell Secure Shell

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad Password: **** cheese. txt 100% 9 1. 0 KB/s 00: 00 Unix Shell Secure Shell

$ scp vlad@moon: /home/vlad/cheese. txt vlad@earth: /users/vlad $ scp -r vlad@moon: /home/vlad/dark_side vlad@earth: /users/vlad -r indicates a directory and its contents Unix Shell Secure Shell

$ scp -r vlad@moon: /home/vlad/dark_side vlad@earth: /users/vlad $ scp -r vlad@moon: /home/vlad/dark_side /users/vlad $ pwd /users/vlad $ scp -r vlad@moon: /home/vlad/dark_side. same destination path Unix Shell Secure Shell

$ ssh vlad@moon Password: **** moon> df –h Filesystem Size Used /dev/sda 1 7. 9 G 2. 1 G /dev/sda 2 791 G 150 G moon> df –h > usage. txt Avail 5. 5 G 642 G Use% Mounted On 28% / 19% /home moon> exit $ scp vlad@moon: /home/vlad/usage. txt. Password: **** usage. txt 100% 134 1. 0 KB/s 00: 00 Unix Shell Secure Shell

$ ssh vlad@moon 'df Password: **** Filesystem Size /dev/sda 1 7. 9 G /dev/sda 2 791 G Unix Shell –h' Used 2. 1 G 150 G Avail 5. 5 G 642 G Use% Mounted On 28% / 19% /home Secure Shell

$ ssh vlad@moon 'df Password: **** Filesystem Size /dev/sda 1 7. 9 G /dev/sda 2 791 G $ ssh vlad@moon 'df Password: **** $ ls -F bin/ notes. txt solar. pdf –h' data/ papers/ swc/ Used Avail Use% Mounted On 2. 1 G 5. 5 G 28% / 150 G 642 G 19% /home –h' >> usage. log mail/ pizza. cfg usage. log music/ solar/ usage. txt same result Unix Shell Secure Shell

character stream $ echo "open sesame, please" | vlad@moon 'cat > magic. txt' Password: **** Unix Shell ssh Secure Shell

character stream $ echo "open sesame, please" | vlad@moon 'cat > magic. txt' Password: **** remote command receives input piped to ssh cat repeats input stream as output Unix Shell remote shell receives stream from pipe ssh redirection within remote shell Secure Shell

before $ ssh vlad@moon 'ls –F /home/vlad' Password: **** bin/ cheese. txt dark_side/ rocks. cfg $ echo "open sesame, please" | ssh vlad@moon 'cat > magic. txt' Password: **** after $ ssh vlad@moon 'ls –F /home/vlad' Password: **** bin/ cheese. txt rocks. cfg Unix Shell dark_side/ magic. txt Secure Shell

before $ ssh vlad@moon 'ls –F /home/vlad' Password: **** bin/ cheese. txt dark_side/ rocks. cfg $ echo "open sesame, please" | ssh vlad@moon 'cat > magic. txt' Password: **** after $ ssh vlad@moon 'ls –F /home/vlad' Password: **** bin/ cheese. txt dark_side/ magic. txt rocks. cfg $ scp vlad@moon: /home/vlad/magic. txt. Password: **** Unix Shell Secure Shell

shell remote shell Unix Shell Secure Shell

public key cannot decrypt using public key encryption using private key (only 1 copy) public key shell remote shell Unix Shell Secure Shell

$ ssh vlad@moon The authenticity of host ‘moon (10. 1. 2. 3)‘ can't be established. RSA key fingerprint is f 1: 68: f 5: 90: 47: dc: a 8: e 9: 62: df: c 9: 21: f 0: 8 b: c 5: 39. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added ‘moon, 10. 1. 2. 3' (RSA) to the list of known hosts. Password: **** moon> Unix Shell Secure Shell

while true: . . . if time. mins == 30: ssh vlad@moon 'df –h' >> usage. log. . . Unix Shell Secure Shell

while true: . . . if time. mins == 30: ssh vlad@moon 'df –h' >> usage. log. . . $ ssh vlad@moon 'df –h' >> usage. log Password: Connection closed by 10. 1. 2. 3 $ Unix Shell waited too long Secure Shell

user key pair 2 user key pair 1 Unix Shell host key pair only 1 copy default if user has no user key pair Secure Shell

$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/users/vlad/. ssh/id_rsa): Enter passphrase (empty for no passphrase): **** Enter same passphrase again: **** press enter Your identification has been saved in /users/vlad/. ssh/id_rsa. Your public key has been saved in /users/vlad/. ssh/id_rsa. pub. The key fingerprint is: d 3: 1 a: 27: 38: aa: 54: e 8: a 5: 03: db: 79: 2 f: b 2: c 3: c 9: 3 d Unix Shell Secure Shell

$ ssh vlad@moon Enter passphrase for key '/users/vlad/. ssh/id_rsa': **** moon> Unix Shell Secure Shell

$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key press enter (/users/vlad/. ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /users/vlad/. ssh/id_rsa. Your public key has been saved in /users/vlad/. ssh/id_rsa. pub. The key fingerprint is: d 3: 1 a: 27: 38: aa: 54: e 8: a 5: 03: db: 79: 2 f: b 2: c 3: c 9: 3 d Unix Shell Secure Shell

$ scp ~/. ssh/id_rsa. pub vlad@moon Password: **** $ ssh vlad@moon Password: **** moon> cat id_rsa. pub >> ~/. ssh/authorized_keys moon> exit $ cat ~/. ssh/id_rsa. pub | ssh vlad@moon 'cat >> ~/. ssh/authorized_keys' Password: **** $ ssh-copy-id vlad@moon Password: **** Unix Shell Secure Shell

$ ssh vlad@moon> while true: . . . if time. mins == 30: ssh vlad@moon 'df –h' >> usage. log. . . Unix Shell Secure Shell

created by Elango Cheran February 2011 Copyright © Software Carpentry 2011 This work is licensed under the Creative Commons Attribution License See http: //software-carpentry. org/license. html for more information.