for f in .; do pre="${f%.}"; suf="${f##.}"; mv -i -f -- "$f" "${pre//./_}.${suf}"; done

ls -1 | wc -l

ls -l . | egrep -c '^-'

vmstat -s -SM | grep "free memory" | awk -F" " '{print$1}'

sed 's/[0-9]\{1,3\}.[0-9]\{1,3\}.[0-9]\{1,3\}.[0-9]\{1,3\}/**IPADDRESS-COMES-HERE**/g' /SourceFilename > /DestinationFilename

time

time()

Time.now # (or Time.new). To display the epoch: Time.now.to_i

import time # first, then int(time.time())

long epoch = System.currentTimeMillis()/1000;

epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;

DateDiff("s", "01/01/1970 00:00:00", Now())

calendar:datetime_to_gregorian_seconds(calendar:now_to_universal_time( now()))-719528*24*3600. # OR element(1, now()) * 10000 + element(2, now()).

SELECT unix_timestamp(now())

SELECT extract(epoch FROM now());

SELECT (SYSDATE - TO_DATE('01-01-1970 00:00:00', 'DD-MM-YYYY HH24:MI:SS')) * 24 * 60 * 60 FROM DUAL

SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())

Math.round(new Date().getTime()/1000.0) // getTime() returns time in milliseconds.

date +%s

Get-Date -UFormat "%s" # Produces: 1279152364.63599

(new Date()).time

perl -e "print time" # (If Perl is installed on your system)

#int( getTickCount() / 1000 )#

date +%s