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TASK02: Add hot plugged/unplugged hardware detector script #116

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TASK02: Add hot plugged/unplugged hardware detector script #116

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45 changes: 45 additions & 0 deletions 02_bash/hwdetect/hwdetect.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
#!/bin/bash

OLDLIST="/tmp/oldlist"
NEWLIST="/tmp/newlist"

update_list()
{
ls /dev/ > $1
}

get_diff()
{
local oldlist_num=`wc -l < $OLDLIST`
local newlist_num=`wc -l < $NEWLIST`
local diff=$(($oldlist_num - $newlist_num))

if [ $(($diff + 0)) -eq 0 ]; then
return 0
fi

return 1
}

print_diff()
{
comm -23 <(sort $OLDLIST) <(sort $NEWLIST) | awk '{print $1 " unplugged" }'

comm -13 <(sort $OLDLIST) <(sort $NEWLIST) | awk '{print $1 " plugged" }'
}



update_list $OLDLIST

while :
do
sleep 1
update_list $NEWLIST
get_diff
diff=$?
if [ $(($diff + 0)) -ne 0 ]; then
print_diff
cp $NEWLIST $OLDLIST
fi
done