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I think it's related to the parent process creating new subprocess and does not have tty. Can anyone explain the detail under the hood? i.e. the related working model of bash, process creation, etc?
It may be a very broad topic so pointers to posts are also very appreciated. I've Googled for a while, all the results are about very specific case and none is about the story behind the scene. To provide more context, below is the shell script resulting the 'bash: no job control in this shell'.
#! /bin/bash while [ 1 ]; do st=$(netstat -an |grep 7070 |grep LISTEN -o | uniq) if [ -z $st ]; then echo "need to start proxy @$(date)" bash -i -c "ssh -D 7070 -N [email protected] > /dev/null" else echo "proxy OK @$(date)" fi sleep 3 done This line:
bash -i -c "ssh -D 7070 -N [email protected] > /dev/null"
is where "bash:no job control in this shell” come from.
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Without job control, you have the ability to put a job in the background by adding & to the command line. And that's about all the control you have. With job control, you can additionally: Suspend a running foreground job with Ctrl Z. Resume a suspended job in the foreground with fg.
Job control refers to the ability to selectively stop (suspend) the execution of processes and continue (resume) their execution at a later point. A user typically employs this facility via an interactive interface supplied jointly by the system's terminal driver and Bash. The shell associates a job with each pipeline.
Install a package Sometimes when you try to use a command and Bash displays the "Command not found" error, it might be because the program is not installed on your system. Correct this by installing a software package containing the command.
You may need to enable job control:
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