Sstrhsrtj

I have two files: file1 and file2.

file1 has the following contents:

---

  host: "localhost"

  port: 3000

  reporter_type: "zookeeper"

  zk_hosts: 

    - "localhost:2181"

file2 contains an IP address (1.1.1.1)

What I want to do is replace localhost with 1.1.1.1, so that the end result is:

---

  host: "1.1.1.1"

  port: 3000

  reporter_type: "zookeeper"

  zk_hosts: 

    - "1.1.1.1:2181"

I have tried:

sed -i -e "/localhost/r file2" -e "/localhost/d" file1

sed '/localhost/r file2' file1 |sed '/localhost/d'

sed -e '/localhost/r file2' -e "s///" file1

But I either get the whole line replaced, or the IP going to the line after the one I need to modify.

Here is a sed solution:

% sed -e "s/localhost/$(sed 's:/:\/:g' file2)/" file1

---

  host: "1.1.1.1"

  port: 3000

  reporter_type: "zookeeper"

  zk_hosts: 

    - "1.1.1.1:2181"

You should use sed -i to make the change inplace.

If you can use awk, here is one way to do:

% awk 'BEGIN{getline l < "file2"}/localhost/{gsub("localhost",l)}1' file1

---

  host: "1.1.1.1"

  port: 3000

  reporter_type: "zookeeper"

  zk_hosts: 

    - "1.1.1.1:2181"

You can read the file with the replacement string using shell command substitution, before sed is used. So sed will see just a normal substitution:

sed "s/localhost/$(cat file2)/" file1 > changed.txt

Try using

join file1 file2

and then, remove any unwanted fields.

I also had this "problem" today: how to replace a block of text with the contents from another file.

I've solved it by making a bash function (that can be reused in scripts). Hope it helps others

[cent@pcmk-1 tmp]$ cat the_function.sh

# This function reads text from stdin, and substitutes a *BLOCK* with the contents from a FILE, and outputs to stdout

# The BLOCK is indicated with BLOCK_StartRegexp and BLOCK_EndRegexp

#

# Usage:

#    seq 100 110 | substitute_BLOCK_with_FILEcontents '^102' '^104' /tmp/FileWithContents > /tmp/result.txt

function substitute_BLOCK_with_FILEcontents {

  local BLOCK_StartRegexp="${1}"

  local BLOCK_EndRegexp="${2}"

  local FILE="${3}"

  sed -e "/${BLOCK_EndRegexp}/a ___tmpMark___" -e "/${BLOCK_StartRegexp}/,/${BLOCK_EndRegexp}/d" | sed -e "/___tmpMark___/r ${FILE}" -e '/___tmpMark___/d'

}



[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$ cat /tmp/FileWithContents

We have deleted everyhing between lines 102 and 104 and

replaced with this text, which was read from a file

[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$ source the_function.sh

[cent@pcmk-1 tmp]$ seq 100 110 | substitute_BLOCK_with_FILEcontents '^102' '^104' /tmp/FileWithContents > /tmp/result.txt

[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$

[cent@pcmk-1 tmp]$ cat /tmp/result.txt

100

101

We have deleted everyhing between lines 102 and 104 and

replaced with this text, which was read from a file

105

106

107

108

109

110