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Forum index » Advanced Topics » Cutting edge

Code that effectively does what inotify does!
Moderators: Flash, Ian, JohnMurga

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stemsee

Joined: 27 Jun 2013
Posts: 2353
Location: In The Way

Posted: Thu 24 May 2018, 06:51 Post subject:

Code that effectively does what inotify does!

How to watch a file, which needs to be read when having been written to, without using inotifywait, but similar outcome.

I was using this

Code:

killall -9 inotifywait
while inotifywait -e close_write /tmp/ap
do
bash -c passwordfn
done

then i changed to this

Code:

function aploop (){
while true
do
read line
if [[ "$line" ]]; then
bash -c passwordfn
unset line
sed -i '1d' /tmp/ap
bash -c aploop
exit
fi
sleep 1
done < /tmp/ap
}; export -f aploop

I am just wondering what other solutions are there??

EDIT: this works too

Code:

while true
do
watch -d -g ls -t -lR /tmp/ap && bash -c passwordfn
sleep 1
done

and this ...

Code:

tail -fn0 /tmp/ap | \
while read line ; do
echo "$line" | grep "+"
if [ $? = 0 ]
then
bash -c passwordfn
fi
done

Tis last one can be reduced to

Code:

tail -fn0 /tmp/ap | \
while read line ; do
[[ "$line" ]] && bash -c passwordfn &
done

but really I want to reduce it so that results from tail immediately trigger passwordfn without 'while read line' ... tht would be more effeicient.

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