bash insert a string variable to a string(another variable) at specific location

Question

I have these 2 variables

to_insert="John"
full_string="My name is and I am 25 years old"

I would like to insert the value of "to_insert" into "full_string" after the word/string "is". Basically I want to get this in the end:

full_string="My name is John and I am 25 years old"

would appreciate your help, Alon

You should add an anchor to full_string, something along the lines of full_string='My name is #{NAME} and I am 25 years old'; full_string="${full_string/"#{NAME}"/John}" — Fravadona
– Fravadona, Commented Nov 29, 2021 at 16:24

choroba · Accepted Answer · 2021-11-29 15:23:32Z

1

Use Parameter Expansion - Substitution:

#! /bin/bash
to_insert="John"
full_string="My name is and I am 25 years old"
echo "${full_string/ is / is "$to_insert" }"

edited Nov 29, 2021 at 15:23

answered Nov 29, 2021 at 15:13

choroba

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Andrej Podzimek · Accepted Answer · 2021-11-29 19:46:05Z

1

to_insert='John'
full_string='My name is and I am 25 years old'
prefix='My name is'

even_fuller_string="${full_string::${#prefix}} ${to_insert} ${full_string:${#prefix} + 1}"
echo "$even_fuller_string"

answered Nov 29, 2021 at 19:46

Andrej Podzimek

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sseLtaH · Accepted Answer · 2021-11-29 17:33:15Z

0

Using sed

$ sed "s/\(.*is\)/\1 $to_insert/" <<< "$full_string"
My name is John and I am 25 years old

answered Nov 29, 2021 at 17:33

sseLtaH

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Hai Vu · Accepted Answer · 2021-11-29 15:32:04Z

0

You can use bash to search for "is" and replace it with "is $to_insert":

to_insert="John"
full_string="My name is and I am 25 years old"
full_string=${full_string/is/is $to_insert}
echo $full_string

Output:

My name is John and I am 25 years old

Reference: Search for "${parameter/pattern/string}" in https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

answered Nov 29, 2021 at 15:32

Hai Vu

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