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Question

In linux, complete the following shell script snippet, to ensure on_exit function is run whenever the SIGINT signal is sent (i.e. when user presses ctr-c):

#!/bin/sh
 
function on_exit ()
{
    echo 'Bye bye'
}
 
[...]
 
sleep 500

Answer

trap on_exit SIGINT

^^ note the use of trap built-in command to bind the signal SIGINT to function on_exit

^^^ note the order of command line arguments given to trap, i.e. the binding functon is given first, then the signal

Question

In linux, complete the following shell script snippet, to ensure on_exit function is run whenever the SIGINT signal is sent (i.e. when user presses ctr-c):

#!/bin/sh
 
function on_exit ()
{
    echo 'Bye bye'
}
 
[...]
 
sleep 500

Answer

Question

In linux, complete the following shell script snippet, to ensure on_exit function is run whenever the SIGINT signal is sent (i.e. when user presses ctr-c):

#!/bin/sh
 
function on_exit ()
{
    echo 'Bye bye'
}
 
[...]
 
sleep 500

Answer

trap on_exit SIGINT

^^ note the use of trap built-in command to bind the signal SIGINT to function on_exit

^^^ note the order of command line arguments given to trap, i.e. the binding functon is given first, then the signal

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20. Advanced Shell Scripting
recieved' } trap on_hangup SIGHUP while true ; do sleep 1 done exit 0 Run the above script and then send the process ID the -HUP signal to test it. (See Section 9.5.) An important function of a <span>program is to clean up after itself on exit. The special signal EXIT (not really a signal) executes code on exit of the script: 5 10 #!/bin/sh function on_exit () { echo 'I should remove temp files now' } trap on_exit EXIT while

Summary

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

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