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#!/bin/bash
# subtimes t1 t2
# -> "t1-t2"
for i in {1..2}
do
inp=$(echo "${@:i:1}" | sed "s/^ *//" | sed "s/ *#.*$//")
p1=$(echo "$inp" | tr ":" " " | awk '{print $1}')
p2=$(echo "$inp" | tr ":" " " | awk '{print $2}')
p3=$(echo "$inp" | tr ":" " " | awk '{print $3}')
for j in {1..2}
do
if [ "$p3" == "" ]
then
p3=$p2
p2=$p1
p1="0"
fi
done
p4=$(echo $p3 | tr "." " " | awk '{print $2}')
while [ ${#p4} -lt 6 ]
do
p4=${p4}"0"
done
f[$i]=$(echo $p4 | sed "s/^0*//" | sed "s/^$/0/")
s[$i]=$(echo $p3 | tr "." " " | awk '{print $1}' | sed "s/^0*//" | sed "s/^$/0/")
m[$i]=$(echo $p2 | sed "s/^0*//" | sed "s/^$/0/")
h[$i]=$(echo $p1 | sed "s/^0*//" | sed "s/^$/0/")
done
fd=$[${f[1]}-${f[2]}]
ut=0
while [ $fd -lt 0 ]
do
ut=$[$ut+1]
fd=$[$fd+1000000]
done
while [ ${#fd} -lt 6 ]
do
fd="0"$fd
done
sd=$[${s[1]}-${s[2]}-$ut]
ut=0
while [ $sd -lt 0 ]
do
ut=$[$ut+1]
sd=$[$sd+60]
done
md=$[${m[1]}-${m[2]}-$ut]
ut=0
while [ $md -lt 0 ]
do
ut=$[$ut+1]
md=$[$md+60]
done
hd=$[${h[1]}-${h[2]}-$ut]
echo $hd":"$md":"$sd"."$fd
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