Random number between 5 and 19
echo $((RANDOM%15+5))
Add two integer variables i.e. a=1 b=2
a=1 b=2 echo $(expr $a + $b) echo $(( a + b ))
File update time
echo $(date -r /bin/sh) # date and time echo $(date -r /bin/sh +%s) # time in epoch seconds
Convert seconds to days, hours, minutes, seconds
age=$(( $(date +%s) - $(date -d '1941/06/28 01:43' +%s) )) # someones age in seconds including epoch correction days=$(( age / 86400 )) hours=$(( age % 86400 / 3600 )) mins=$(( age % 86400 % 3600 / 60 )) secs=$(( age % 86400 % 3600 % 60 )) echo $days days $hours hours $mins minutes $secs seconds
Calculate # days in current month
m1=$(date +%m) # Current month y1=$(date +%Y) # Current year es1=$(date +%s -d $m1/01/$y1) # Epoch seconds (1st of current month) m2=$(( m1 %12 +1 )) # Next month y2=$y1 # Init year of next month [ $m2 -eq 1 ] && ((y2+=1)) # Adjust year of next month es2=$(date +%s -d $m2/01/$y2) # Epoch seconds (1st of next month) monlen=$(( (es2 - es1)/86400 )) # Number of days
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| Many thanks to Debra Lynn and Ian Murdock for making Debian possible | |
| First created ~ Last revised October 06, 2011 |
