Webdate +%s.%N -d $1 takes an arbitrary date and converts it to a given format (as in this case +%s.%N, a float of seconds). Be aware that-d is not a part of POSIX date. [But] as long … WebYou can subtract this from a variable that containts current date in milliseconds using $ ( ( )): dd=$ ( ($ (date +'%s * 1000 + %-N / 1000000'))) ddmin5=$ ( ($dd - 300000)) echo $ddmin5 The milliseconds calculation comes from this answer Share Improve this answer Follow edited Apr 13, 2024 at 12:36 Community Bot 1 answered Sep 22, 2014 at 4:39
Subtract -1 from a date in Unix script
WebApr 14, 2024 · The Bash declare command allows integer calculations. To use declare for calculations, add the -i option. For example: declare -i x=2 y=3 z=x+y Echo each variable to see the results: echo $x + $y = $z The output prints each variable to the console. expr Command The expr command is a legacy command line utility for evaluating integer … WebApr 15, 2014 · Subtract Seconds from Date Command Hi, Need to subtract 5 seconds after syncing my Linux server from NTP like; #ntpdate time.myorg.int. This script will only run once in each morning at 9 AM. Please help me. 6. Shell Programming and Scripting Add/Subtract Time images of sick emojis
date command in Linux with examples - GeeksforGeeks
WebJul 9, 2024 · I have it setup like this: #! /bin/bash #When to execute command execute=$ (date +"%T" -d "22:30:00") #Current time time=$ (date +"%T") #Subtract one from the … WebDec 24, 2024 · The date command is pretty flexible about its input. You can use that to your advantage: #!/bin/bash var1="23:30" var2="20:00" # Convert to epoch time and calculate difference. difference=$ ( ( $ (date -d "$var1" "+%s") - $ (date -d "$var2" "+%s") )) # Divide the difference by 3600 to calculate hours. echo "scale=2 ; $difference/3600" bc WebJul 18, 2024 · The bash math also allows you to use boolean and logical expressions within doubt parenthesis to perform mathematical calculations. Example: $ ( (x=10)); ( (y=5)) if ( ( x > y )); then echo $x; fi This example compares two variables and outputs the value of x only if it is greater than y. list of bond movies by year