How to make the callback example run in bash?
I had read a discussion on bash's callback,jlliagre post an amazing example.
callback example posted by jlliagre
Recite the main points here.
1.Create callback-example and run it on terminal with ./callback-example.
#!/bin/bash
myCallback() {
echo "I've been called at $(date +%Y%m%dT%H%M%S)"
}
# Set the handler
trap myCallback SIGUSR1
# Main loop. Does nothing useful, essentially waits
while true; do
read foo
done
2.On another terminal, send the USR1 signal to the shell process.
$ pkill -USR1 callback-example
The author say :Each signal sent should trigger the display of lines like these ones in the first terminal:
I've been called at 20180925T003515
I've been called at 20180925T003517
I found that it never happen in my bash,how to fix it and run in bash?
bash callback pkill
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
add a comment |
I had read a discussion on bash's callback,jlliagre post an amazing example.
callback example posted by jlliagre
Recite the main points here.
1.Create callback-example and run it on terminal with ./callback-example.
#!/bin/bash
myCallback() {
echo "I've been called at $(date +%Y%m%dT%H%M%S)"
}
# Set the handler
trap myCallback SIGUSR1
# Main loop. Does nothing useful, essentially waits
while true; do
read foo
done
2.On another terminal, send the USR1 signal to the shell process.
$ pkill -USR1 callback-example
The author say :Each signal sent should trigger the display of lines like these ones in the first terminal:
I've been called at 20180925T003515
I've been called at 20180925T003517
I found that it never happen in my bash,how to fix it and run in bash?
bash callback pkill
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
add a comment |
I had read a discussion on bash's callback,jlliagre post an amazing example.
callback example posted by jlliagre
Recite the main points here.
1.Create callback-example and run it on terminal with ./callback-example.
#!/bin/bash
myCallback() {
echo "I've been called at $(date +%Y%m%dT%H%M%S)"
}
# Set the handler
trap myCallback SIGUSR1
# Main loop. Does nothing useful, essentially waits
while true; do
read foo
done
2.On another terminal, send the USR1 signal to the shell process.
$ pkill -USR1 callback-example
The author say :Each signal sent should trigger the display of lines like these ones in the first terminal:
I've been called at 20180925T003515
I've been called at 20180925T003517
I found that it never happen in my bash,how to fix it and run in bash?
bash callback pkill
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
I had read a discussion on bash's callback,jlliagre post an amazing example.
callback example posted by jlliagre
Recite the main points here.
1.Create callback-example and run it on terminal with ./callback-example.
#!/bin/bash
myCallback() {
echo "I've been called at $(date +%Y%m%dT%H%M%S)"
}
# Set the handler
trap myCallback SIGUSR1
# Main loop. Does nothing useful, essentially waits
while true; do
read foo
done
2.On another terminal, send the USR1 signal to the shell process.
$ pkill -USR1 callback-example
The author say :Each signal sent should trigger the display of lines like these ones in the first terminal:
I've been called at 20180925T003515
I've been called at 20180925T003517
I found that it never happen in my bash,how to fix it and run in bash?
bash callback pkill
bash callback pkill
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
edited Nov 18 '18 at 13:42
Cyrus
45.3k43676
45.3k43676
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
asked Nov 18 '18 at 13:33
scrapyscrapy
173219
173219
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Your script appears in the process list as /bin/bash ./callback-example and not only as ./callback-example.
Add option -f to your pkill command.
From man pkill:
-f: The pattern is normally only matched against the process name. When -f is set, the full command line is used.
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
add a comment |
kill -USR1 `ps aux|grep callbac[k] |awk '{print $2}'`
OR
pkill -USR1 -f callback-example
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your script appears in the process list as /bin/bash ./callback-example and not only as ./callback-example.
Add option -f to your pkill command.
From man pkill:
-f: The pattern is normally only matched against the process name. When -f is set, the full command line is used.
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
add a comment |
Your script appears in the process list as /bin/bash ./callback-example and not only as ./callback-example.
Add option -f to your pkill command.
From man pkill:
-f: The pattern is normally only matched against the process name. When -f is set, the full command line is used.
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
add a comment |
Your script appears in the process list as /bin/bash ./callback-example and not only as ./callback-example.
Add option -f to your pkill command.
From man pkill:
-f: The pattern is normally only matched against the process name. When -f is set, the full command line is used.
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
Your script appears in the process list as /bin/bash ./callback-example and not only as ./callback-example.
Add option -f to your pkill command.
From man pkill:
-f: The pattern is normally only matched against the process name. When -f is set, the full command line is used.
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
edited Nov 18 '18 at 13:57
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
answered Nov 18 '18 at 13:41
CyrusCyrus
45.3k43676
45.3k43676
add a comment |
add a comment |
kill -USR1 `ps aux|grep callbac[k] |awk '{print $2}'`
OR
pkill -USR1 -f callback-example
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
add a comment |
kill -USR1 `ps aux|grep callbac[k] |awk '{print $2}'`
OR
pkill -USR1 -f callback-example
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
add a comment |
kill -USR1 `ps aux|grep callbac[k] |awk '{print $2}'`
OR
pkill -USR1 -f callback-example
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
kill -USR1 `ps aux|grep callbac[k] |awk '{print $2}'`
OR
pkill -USR1 -f callback-example
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
answered Nov 18 '18 at 16:55
scrapyscrapy
173219
173219
add a comment |
add a comment |
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