help for script

wsamael

hello sorry for late, i looking for my problem, and I think it's better to activate root user by a script but how change " /etc/ssh/sshd_config " to to make" yes" in PermitRootLogin and activate the line ( remove the # ) in this files ?
I' dont know how to do that. because i must edit files and change root password. Could I do that with a script ?

mitu

@wsamael said in help for script:

hello sorry for late, i looking for my problem, and I think it's better to activate root user by a script but how change " /etc/ssh/sshd_config " to to make" yes" in PermitRootLogin and activate the line ( remove the # ) in this files ?

This shouldn't be needed. You may be better explaining how are you executing the script, activating the root account's password is not needed just to change some permissions.

The instructions you've posted eariler on (chmod ..) are wrong - they make the corresponding configuration files writable by any user/account on the system, which is incorrect.

Clyde

@wsamael said in help for script:

how change " /etc/ssh/sshd_config " to to make" yes" in PermitRootLogin and activate the line ( remove the # ) in this files ?

connect a keyboard to your Pi
press F4 in Emulation Station to exit to Retropie's command shell
enter sudo nano /etc/ssh/sshd_configto edit that file
make your changes
press Ctrl+x to exit, answer y for YES to save your changes, and press Enter to confirm the filename
enter sudo systemctl reload sshd.service to reload the new sshd configuration
enter exit in the command line to get back to Emulation Station

OR

Instead of 3. to 5. in the above sequence, just execute sudo sed -i 's/#PermitRootLogin no/PermitRootLogin yes/g' /etc/ssh/sshd_config to change any occurrences of #PermitRootLogin no to PermitRootLogin yes. Then proceed with 6.

(See https://linuxize.com/post/how-to-use-sed-to-find-and-replace-string-in-files/ to learn the ancient art of sed-fu to search and replace strings in text files.)

edit: Forgot the actual file to change in the sed command. 😇
edit 2: Inserted sshd reload command as 6.

wsamael

so i've test that but it's not ok

#!/bin/bash
for /#/PermitRootLogin prohibit-password in /etc/ssh/sshd_config
do
  echo "Traitement de $file ..."
  sed -i -e "s/#PermitRootLogin prohibit-password/PermitRootLogin yes/g" "$root_user"
done 

i launch with sudo ./test.sh but  "sudo: ./test.sh: command not found
" any idea ? my script is ok or not ?

Clyde

@wsamael sudo ./test.sh means "run the file test.sh in the current directory with root permissions". But it says that it couldn't find such a file there. Do you run this command from the directory where test.sh is located?

If you are, then please show us the output of ls -la executed in the directory where test.sh is located (the l are little L).

my script is ok or not ?

That depends on what you want it to do. Could you explain it, please?

I don't understand the line for /#/PermitRootLogin prohibit-password in /etc/ssh/sshd_config in your script. What is it supposed to do?
You are using the variables $file and $root_user without defining them first. Or do you do that before running the script?

wsamael

yes i run this from the directory where i put test.sh

i' ve follow this tuto and try to make my script

#!/bin/bash
for file in *.txt
do
  echo "Traitement de $file ..."
  sed -i -e "s/chaine1/chaine2/g" "$file"
done

i must do a mistake

Clyde

We are talking about to problems here: a) the script itself (i.e. its contents) and b) how to run it from the command shell or from another script.

You still didn't explain what you actually want the script to do. It's hard to say if your script is correct if I don't know what it is supposed to do. It's quite clear that you want to replace #PermitRootLogin prohibit-password with PermitRootLogin yes. But the for…do…done loop does that for a number of files. Why that if there's only one sshd_config? Which tutorial are you referring to? (link please)

As for problem b), you also didn't give me the output of ls -la run from inside the same directory that test.sh is in. Please do so.

wsamael

so for the b ;)
i just wanna replace "#PermitRootLogin prohibit-password" to "PermitRootLogin yes" in only one files "etc/ssh/sshd_config" i don't need a loop my mistake

for the a

the "test.sh" is in the directory

the tuto
http : //www.tux-planet . fr/remplacer-un-chaine-de-caractere-avec-la-commande-sed/

ps delete the space to / and . in the url I cant' post the link

Clyde

Try type ./test.sh. If this also doesnt work, your filename may contain invisible characters that nevertheless count as part of the filename (creating the file in Windows may do that). See here for a more thorough explanation and solution approach.

If, however, type does work, try sudo bash ./test.sh to execute the script in a new bash instance. Depending on your system's setup, sudo may not like to execute scripts directly.

wsamael

ok sudo bash ./test.sh launch the script ( the probleme a it's solved ;) ) but it's not work ( the problem b still here ;) )

Clyde

If it's still the same as in your post above, it can't work unless you fill the variables with content. 🧐

wsamael

hello sorry for long silent, i've try many thing today

if i've type

sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config

it's work but if I make this in a script, it's don't work

#!/bin/bash

sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config

echo "root activate"

i' ve this message

pi@retropie:~ $ sudo bash ./root.sh
./root.sh: line 2: $'\r': command not found
: No such file or directoryhd_config
./root.sh: line 4: $'\r': command not found

someone have an idea ?

mitu

@wsamael said in help for script:

i' ve this message

Your script has Windows (DOS) line endings, make sure you edit the script with an editor that understands Unix line endings and set your editor to save your script correctly. When in doubt, use Notepad++.

Clyde

Or you could do it in Retropie's command line:

sed -i 's/\r$//' root.sh

or

sudo apt install dos2unix  # only needed once to install dos2unix
dos2unix root.sh

Both edit the file in place, so be sure to have a backup if anything goes wrong.

Source: https://askubuntu.com/questions/803162/how-to-change-windows-line-ending-to-unix-version

wsamael

@mitu usually I use sublim text but not this time my mistake

wsamael

@Clyde the first solution it's for convert my script to unix script ? Good to know. I'll try this, but for my next script i would like to make them in unix language ;)

Clyde

@wsamael said in help for script:

@Clyde the first solution it's for convert my script to unix script ?

Both are. The first doesn't require the installation of another tool, as sed is party of most Linux base installations; the second may be more easy to remember as something like 's/\r$//'. ;)

wsamael

I try

sed -i 's/\r$//' root.sh

it's work but I see no difference beetwen my script, how did you see what 's wrong with my script ? (i would be understand ^^ )

Clyde

@wsamael Your error message said:

'\r': command not found

Windows ends a line in a text file with a carriage return (\r) and a line feed (\n), wheras unixoid systems only use \n. Thus Retropie's command shell bash rejected the \r in your file as an unknown command.

wsamael

ok i understand thank you ;)