'How do you append to an already existing string?

I want append to a string so that every time I loop over it, it will add "test" to the string.

Like in PHP you would do:

$teststr = "test1\n"
$teststr .= "test2\n"
echo = "$teststr"

Returns:

test1
test2

But I need to do this in a shell script

stringbashshellstring-concatenation


Solution 1:[1]

$ string="test"
$ string="${string}test2"
$ echo $string
testtest2

Solution 2:[2]

#!/bin/bash
message="some text"
message="$message add some more"

echo $message

some text add some more

Solution 3:[3]

teststr=$'test1\n'
teststr+=$'test2\n'
echo "$teststr"

Solution 4:[4]

VAR=$VAR"$VARTOADD(STRING)"   
echo $VAR

Solution 5:[5]

thank-you Ignacio Vazquez-Abrams

i adapted slightly for better ease of use :)

placed at top of script

NEW_LINE=$'\n'

then to use easily with other variables

variable1="test1"
variable2="test2"

DESCRIPTION="$variable1$NEW_LINE$variable2$NEW_LINE"

OR to append thank-you William Pursell

DESCRIPTION="$variable1$NEW_LINE"
DESCRIPTION+="$variable2$NEW_LINE"

echo "$DESCRIPTION"

Solution 6:[6]

#!/bin/bash

msg1=${1} #First Parameter
msg2=${2} #Second Parameter

concatString=$msg1"$msg2" #Concatenated String
concatString2="$msg1$msg2"

echo $concatString 
echo $concatString2

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 ghostdog74
Solution 2 Jim
Solution 3 Ignacio Vazquez-Abrams
Solution 4
Solution 5 n1ce-0ne
Solution 6 Danila Ganchar

Related Questions