What is the best way to change a character in a string in shell script ?
I have the following variable:
A="2017-03-16 18:00:00"
I would like to change it for "2017-03-16 18:00:01" (adding +1)
Add a comment
|
2 Answers
You can use the date command to add 1 second to a specific date:
$ date -d "2017-03-16 18:00:00+1 seconds"
Thu Mar 16 13:00:01 EDT 2017
(Note that this converted to local timezone EST)
Incorporated into your script, that would be:
#!/bin/sh
A="2017-03-16 18:00:00"
date -d "$A+1 seconds"
answered Mar 17, 2017 at 13:25
Hunter McMillen
61.8k25 gold badges124 silver badges176 bronze badges
4 Comments
andrefurquin
I would like to do something like that A[18]=1 like in C, for instance.
andrefurquin
I was able to accomplish that like that echo $A | sed s/./1/19.
Hunter McMillen
That isn't the question you asked.
andrefurquin
This was not what I asked, but I found out your solution was better. Thank you!
If you want to Change character of a string in shell script as mentionned in your title, you can use parameter expansion:
$ A="2017-03-16 18:00:00"
$ echo ${A%0}1
2017-03-16 18:00:01
If you want to add 1 second to a date, then Hunter McMillen's answer does the job.
