How do you find the difference between two timestamps in Unix?

First, calculate convert the dates to be compared into unix timestamps:

  1. date1=$(date –date=”2020-10-31 05:41:33″ “+%s”)
  2. date2=$(date –date=”2020-11-01 05:41:33″ “+%s”)

How do you find the difference between two files in UNIX?

The different file comparison commands used in Unix are cmp, comm, diff, dircmp, and uniq.

  1. Unix Video #8:
  2. #1) cmp: This command is used to compare two files character by character.
  3. #2) comm: This command is used to compare two sorted files.
  4. #3) diff: This command is used to compare two files line by line.

How does shell script calculate time difference?

An integer value of elapsed seconds:

  1. Bash variable SECONDS (if SECONDS is unset it loses its special property).
  2. Bash printf option %(datefmt)T : a=”$(TZ=UTC0 printf ‘%(%s)T\n’ ‘-1’)” ### `-1` is the current time sleep 1 ### Process to execute elapsedseconds=$(( $(TZ=UTC0 printf ‘%(%s)T\n’ ‘-1’) – a ))

How does diff work in Unix?

On Unix-like operating systems, the diff command analyzes two files and prints the lines that are different. In essence, it outputs a set of instructions for how to change one file to make it identical to the second file.

How do you compare timestamps?

When comparing two TIMESTAMP WITH TIME ZONE values, the comparison is made using the UTC representations of the values. Two TIMESTAMP WITH TIME ZONE values are considered equal if they represent the same instance in UTC, regardless of the time zone offsets that are stored in the values. For example, ‘1999-04-15-08.00.

How do you find the difference between second dates?

How to get seconds between two dates in javascript

  1. var t1 = new Date(“2021-08-25 07:41:07”);
  2. var t2 = new Date(“2021-08-25 07:50:07”);
  3. var dif = ( t2. getTime() – t1. getTime() ) / 1000;
  4. console. log(dif)

How does Linux calculate elapsed time?

Measure elapsed time internally in a script

  1. START_TIME=$(date +%s)
  2. sleep 1 # put some real task here instead of sleeping.
  3. END_TIME=$(date +%s)
  4. echo “It took $(($END_TIME – $START_TIME)) seconds to sleep of 1 second…”

How does bash calculate elapsed time?

Measure Elapsed Time in Milliseconds in Bash To measure elapsed time with millisecond resolution, use date with +%s. %3N option, which returns the current time in milliseconds.