Bash - Appending values to variable

Question

I am still snooping around bash as a newbie and I wanted to ask some question Is it possible to append additional text to value in bash? Example below:

#!/bin/bash
value1="qwerty"
value2="asdfgh"

echo $value1 >> $value3
echo $value2 >> $value3
echo $value3

So my question is - can I create value that contain other values? Why am I trying to do this? Because I want to do some logical functions for each value and if it meets the criteria it gets appended to my final value. By the end I would echo value3 and it would contain all results that met criteria.

`$value3` is, specifically, the *value* of the variable, not the variable itself. If `>>` *did* work with variables, you would write something like `echo "$value1" >> value3` (But in reality, this just appends the contents of `value1` to a file named `value3`.) — chepner, Mar 23 '22 at 13:16

chepner · Answer 1 · 2022-03-23T13:48:35.657

0

>> is for writing to files, not appending to variables. You just want string interpolation.

value3="$value1$value2"

If you want an embedded newline, you can do that:

value3="$value1
$value2"

If you want to append a value to an existing variable,

value3=$value1

value3="$value3
$value2"

edited Mar 23 '22 at 13:48

answered Mar 23 '22 at 13:15

chepner

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Thank you! But returned value displays then in one row. Can I enter carriage returns? – veetay Mar 23 '22 at 13:30
And also it will add value1 to value3 even if it will not meet the criteria. – veetay Mar 23 '22 at 13:30
1

What criteria? You never mentioned anything about that in your question. – chepner Mar 23 '22 at 13:48

Bash - Appending values to variable

1 Answers1