Shell Programming and Scripting

cat logs | awk -F";" '{ system("date -d "1970-01-01 UTC+0100 $1 seconds""); }'
date: date invalide `1968641199401200'
date: date invalide `1968641199381709'

cat logs
1199401200;a
1199381709;b

while IFS=";" read a b
do
    date -d "1970-01-01 UTC+0100 $a seconds"
done  < file

for mytimestamp in $(cat logs| awk -F";" '{ print $1; }'); do echo $(date -d “1970-01-01 UTC+0100 $mytimestamp seconds”); done

while IFS=";" read a b
do
    echo $(date -d "1970-01-01 UTC+0100 $a seconds")";"$b
done  < file