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$ echo "Date finished: Sun Dec 29 23:47:25 2019" | sed -e 's/^[^:]*: //'
Sun Dec 29 23:47:25 2019

#!/bin/sh
#
#  
#

TD="2019-12-29 23:47:25"
TDS=$(date -d "$TD" +%s)
TL=604800
RTD=$(( TL + TDS ))

echo TD: $TD
echo TDS: $TDS
echo TL: $TL
echo RTD: $RTD

if [ "$RTD" -le "$(date +%s)" ]; then
    echo less or equal
else
    echo more
fi

TD: 2019-12-29 23:47:25
TDS: 1577652445
TL: 604800
RTD: 1578257245
more

#!/bin/bash
TIME_LIFE="604800"
TORRENTLIST=$(transmission-remote -l | sed -e '1d' -e '$d' | awk '{print $1}' | sed -e 's/[^0-9]*//g')
if [ "$TORRENTLIST" ]; then
        for TORRENTID in $TORRENTLIST 
        do
                TINFO=$(transmission-remote -t $TORRENTID -i)
                #TSTATE=$(echo -e "$TINFO" | grep -e "State: Seeding\|State: Finished\|State: Idle\|State: Stopped")
                TDATE=$(echo -e "$TINFO" | grep -e "Date finished:")
                if [ "$TDATE" ]; then
                        RTD=$(date -d "$(echo -e $TDATE | sed 's/^Date finished: //')" +%s)
                        if [ $(($RTD+$TIME_LIFE)) -le $(date +%s) ]; then
                                transmission-remote -t $TORRENTID --remove-and-delete 
                        fi
                fi
                #echo $TDATE
                #if [ $TSTATE ]; then
                #       echo $TORRENTID
                #fi
        
        done
fi

echo 'Date finished: Sun Dec 29 23:47:25 2019' | sed 's/Date finished: //' | awk '{print $1",", $3, $2, $5, $4}' | date +%s -d -
1577653200

date: неверная дата «-e Date finished: Sat Dec 28 14:39:21 2019»
21
date: неверная дата «-e Date finished: Sun Dec 29 23:48:38 2019»
22
date: неверная дата «-e Date finished: Sun Dec 29 23:47:25 2019»
23

sed 's/Date finished: //' | awk '{printf "\"%s, %s %s %s %s\"",$1, $3, $2, $5, $4}' | xargs -r date +%s -d

ADATE=$(echo $TDATE | sed 's/^Date finished: //')
RTD=$(date -d "$ADATE" +%s)

echo 'Sun Dec 29 23:47:25 2019' | date +%s -d -
1577653200

date +%s -d "2019-12-29 23:47:25"
1577652445

1577518761
1577518761
1577638118
1577638118
1577638045
1577638045

RTD=$(date -d "${TDATE#Date finished: }" +%s)