Tagged Questions
4
votes
3answers
123 views
What process is running before I even get a prompt?
When I log in to a specific server I see the following:
Note that I get get Last login: ... information but no prompt. I hit Ctrl+C and only then do I get my prompt, thus proving that my username ...
3
votes
1answer
81 views
A script's background process is still alive after closing the terminal
This is more of a process management/signal handling question than a Bash question. It just uses Bash to explain the issue.
I'm running a Bash script in which I run a background process.
This is the ...
6
votes
3answers
257 views
What's the difference between Ctrl-Z and kill -STOP?
When I run a command (make on a large project) from the shell, I can type Ctrl-Z to stop the process and return to the shell. Subsequently, I can run fg to continue the process.
I'm trying to write a ...
2
votes
1answer
57 views
Chain commands with Control + C interrupt
I am trying to execute a program which loops indefinitely, and so must be forcibly interrupted. After executing the program, I want to delete it. I can do it in several steps:
./MyProg
Control + C
...
5
votes
1answer
356 views
“trap … INT TERM EXIT” really necessary?
Many examples for trap use trap ... INT TERM EXIT for cleanup tasks. But is it really necessary to list all the three sigspecs?
The manual says:
If a SIGNAL_SPEC is EXIT (0) ARG is executed on ...
2
votes
2answers
204 views
Why can't I kill a timeout called from a Bash script with a keystroke?
[Edit: This looks similar to some other questions asking how to kill all spawned processes – the answers all seem to be to use pkill. So the core of my question may be: Is there a way to propagate ...
1
vote
0answers
136 views
Why does this pipeline get SIGTTIN?
When I run the command for i in *.log; do cat "$i" | sort; done | more, the pipeline gets a SIGTTIN signal and is stopped.
bash$ for i in *.log; do cat "$i" | sort; done | more
### (one screenful of ...
5
votes
3answers
1k views
How can I kill and wait for background processes to finish in a shell script when I Ctrl+C it?
I'm trying to set up a shell script so that it runs background processes, and when I Ctrlc the shell script, it kills the children, then exits.
The best that I've managed to come up with is this. It ...
3
votes
3answers
2k views
How to stop the loop bash script in terminal?
For example,
#!/bin/bash
while :
do
sl
done
How to terminate this bash script?
3
votes
4answers
1k views
Terminating an infinite loop
I have a command that I want to have run again automatically each time it terminates, so I ran something like this:
while [ 1 ]; do COMMAND; done;
but if I can't stop the loop with Ctrl-c as that ...
3
votes
1answer
390 views
Issue with WINCH signal - what am I overlooking?
I am having an issue with the WINCH signal in the following code which is from a tutorial located at developerWorks®:
#!/bin/bash
trap 'get_window_size' WINCH # trap when a user ...
3
votes
2answers
1k views
How can I trap a program that returns 139 (segmentation fault) in bash?
I have a bash script that tests some programs and one of the program returns Segmentation fault so I tried to add a trap in the head of my script:
trap "echo 'segfault occured!'" SIGSEGV
That ...
3
votes
2answers
366 views
Wrapper program that sets signal handler
I would like to have a wrapper program that runs a given command and sets a signal handler so that it gets run when the command receives a specified signal.
The question is this:
Is there an ...
2
votes
1answer
1k views
What is signal 0 in a trap command?
I'm following this guide on how to set up passwordless SSH authentication with ssh-agent.
To start up ssh-agent the author recommends the following code in .bash_profile:
SSHAGENT=/usr/bin/ssh-agent
...
0
votes
1answer
1k views
Can you specify a separate trap in a subshell created with ()?
I'm writing a script that starts a subshell to go off and do some work. In a special case, the script needs to tell the subshell to cleanly stop what it's doing and exit early. However, my ...
