Return to Answer

Change

ligne=`cat /var/log/svlog | grep  "\$day"`    

to

ligne=$(grep "$day" /var/log/svlog)

Change

ligne=`cat /var/log/svlog | grep  "\$day"`    

to

ligne=$(grep "$day" /var/log/svlog)

To feed the contents of $ligne to awk, use

echo "$ligne" | awk ...

You can reduce

ligne=`cat /var/log/svlog | grep  "\$day"`    
$ligne >> log1.txt  

to

echo "$(grep "$day" /var/log/svlog)" >> log1.txt

Change

ligne=`cat /var/log/svlog | grep  "\$day"`    

to

ligne=$(grep "$day" /var/log/svlog)

You can reduce

ligne=`cat /var/log/svlog | grep  "\$day"`    
$ligne >> log1.txt  

to

echo $(grep "$day" /var/log/svlog) >> log1.txt

You can reduce

ligne=`cat /var/log/svlog | grep  "\$day"`    
$ligne >> log1.txt  

to

echo "$(grep "$day" /var/log/svlog)" >> log1.txt