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Full Discussion: Vi : Is it possible to send ctrl + d signal from a file made with vi and executing it.
Top Forums Shell Programming and Scripting Vi : Is it possible to send ctrl + d signal from a file made with vi and executing it. Post 302789487 by Yoda on Wednesday 3rd of April 2013 05:59:43 PM
Old 04-03-2013
Can you tell us what exactly you are trying to do?

If you are trying to instruct a script to handle certain task while it is already running, then you can use trap to catch a user-defined signal and perform an action.

For example, here is a script:
Code:
#!/bin/ksh

while :
do
        trap "echo Date: $(date)" USR1
        echo "Sleeping for 5 seconds..."
        sleep 5
done

If you run this script on a session and from another session if you send a USR1 signal to the running script PID, the trap argument will be executed:
Code:
kill -USR1 <PID>

Modify it as per your requirement. I hope this helps.
 

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LEARN ABOUT SUSE

runit

runit(8)						      System Manager's Manual							  runit(8)

NAME

       runit - a UNIX process no 1

SYNOPSIS

       runit

DESCRIPTION

       runit must be run as Unix process no 1.	It performs the system's booting, running, and shutdown in three stages:

STAGE 1
       runit  runs  /etc/runit/1  and  waits  for  it  to terminate.  The system's one time tasks are done here.  /etc/runit/1 has full control of
       /dev/console to be able to start an emergency shell if the one time initialization tasks fail. If /etc/runit/1 crashes, or exits 100, runit
       will skip stage 2 and enter stage 3.

STAGE 2
       runit  runs  /etc/runit/2,  which  should  not  return  until system shutdown; if it crashes, or exits 111, it will be restarted.  Normally
       /etc/runit/2 starts runsvdir(8).  runit is able to handle the ctrl-alt-del keyboard request in stage 2, see below.

STAGE 3
       If runit is told to shutdown the system, or stage 2 returns, it terminates stage 2 if it is running, and runs  /etc/runit/3.   The  systems
       tasks  to  shutdown  and  possibly halt or reboot the system are done here.  If stage 3 returns, runit checks if the file /etc/runit/reboot
       exists and has the execute by owner permission set.  If so, the system is rebooted, it's halted otherwise.

CTRL-ALT-DEL
       If runit receives the ctrl-alt-del keyboard request and the file /etc/runit/ctrlaltdel exists and has the execute by owner permission  set,
       runit runs /etc/runit/ctrlaltdel, waits for it to terminate, and then sends itself a CONT signal.

SIGNALS

       runit only accepts signals in stage 2.

       If  runit  receives a CONT signal and the file /etc/runit/stopit exists and has the execute by owner permission set, runit is told to shut-
       down the system.

       if runit receives an INT signal, a ctrl-alt-del keyboard request is triggered.

SEE ALSO

       runit-init(8), runsvdir(8), runsvchdir(8), sv(8), runsv(8), chpst(8), utmpset(8), svlogd(8)

       http://smarden.org/runit/

AUTHOR

       Gerrit Pape <pape@smarden.org>

																	  runit(8)
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