line-replace

line-replace

Replace a line in a file with passed string.

Install

Global, for command line usage: npm install -g line-replace

Local, for programatic usage in your project: npm install --save line-replace

Command line usage

    USAGE:
      line-replace [file]:[line] [[string]]

    EXAMPLE:
      line-replace sample.txt:7 'New content for line seven.'


    Passed string will replace passed line number on passed file.
    If string is not provided, the line will be cleared.

Programatic usage

const lineReplace = require('line-replace')
lineReplace({
  file: 'a-file.txt',
  line: 42,
  text: 'Answer to the Ultimate Question of Life, the Universe, and Everything.',
  addNewLine: true,
  callback: ({file, line, text, replacedText}) => {}
})

addNewLine defaults to true, which doesn't add or remove lines from the original document.

Setting it to false is the equivalent of removing the passed line and appending the passed text to the next line.

For example, with the following content:

First line.
Second line.
Third line.

Running:

lineReplace({
  file: 'the-file.txt',
  line: 2,
  text: 'LOOK: ',
  addNewLine: false,
  callback: ({file, line, text, replacedText}) => {}
})

Will result in:

First line.
LOOK: Third line.

Should it work with big files?

Yeah. line-replace uses read and write streams, so it should work ok with big files.

Enjoy!