Passing Ctrl+A in shell scripting

Shell Programming and Scripting
1

Hello ,

I'm writing script that i use screen to mutiplexe my screen and t not stop execution when ssh connection is closed whit my other PC .

So my question is how to send Ctrl+A and Ctrl+D in shell scriting code :confused:

Thanks

2

You can use printf '\001' and printf '\004' respectively to print the character.

To put it in a variable, you can use var=$(printf '\001\') or var=$(printf '\004\') .
In bash you can use var=$'\001' and $'\004'
Otherwise you can enter the hard character by using CTRL-V CTRL-A or CTRL-V CTRL-D

3

Sorry can youu explain to me more !

I try both of them but bash interpreter don't know them
I woant to use them with screen command
Thanks

---------- Post updated at 05:51 AM ---------- Previous update was at 04:59 AM ----------

Hi,

My use case is to connect to remote server on ssh connection and execute command that it don't be stopped when my pc execute standby mode (standby mode will down ssh connection)

Please help

4

Please explain what you mean first. What was the error message? What exactly did you do? Was there an error message? (Actually, last time i checked, bash didn't have an error message like "i do not know....", so, instead of paraphrasing what you might have seen, show us what you in fact did see.)

I tried Scrutinizers approaches and all of them worked, so chances are you did something wrong, not he. To find out what you did wrong we simply lack the necessary input - otherwise we'd be glad to tell you.

I hope this helps.

bakunin

5

Do you want your other PC going to sleep?
If not disable the sleep mode, what OS is running on this other PC we may be able to assist in setting this up.

If you would still like your other PC to sleep consider using wake-on-lan to wake your other PC up first before trying to access it with ssh. I'm thinking of something like this:

if ! nc -z otherPC 22 > /dev/null 2>&1
then
    echo "Waking up otherPC..."
    wol 00:1D:99:99:AC:99
fi
ssh otherPC screen ...

Note change 00:1D:99:99:AC:99 to the MAC address of the otherPC network card

wol may not be available natively on your system you can download it from the SourceForge wol project

6

I have armv7 board and i will execute script with ssh connection from board to PC .

I have to test when board in standby mode the script runned by ssh connection from board remain working .
The result is the reverse when kernel is in standby mode .
SSh connection closed and the script end .

Any sugestion please

Thanks