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How to replace a string at specific line number in a text file?

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raju patel
raju patel on 13 Jan 2020
Commented: Rik on 31 Jan 2020
%%.text file contain%%%
In this
part a
simple
method for
floating‐point
to fixed‐point
%%%new .text file contain%%
In this
part a
simple
method for
/////newly added string///
to fixed‐point
how to replace the string at specific line number?
  3 Comments
Rik
Rik on 31 Jan 2020
Adding the names of frequent contributors as tags only proves you have seen several questions, which means you should know how to write a complete question. It generally does not attract actual attention.

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Answers (1)

Andrew Janke
Andrew Janke on 31 Jan 2020
Try this:
  • Read in the whole text file
  • Split it on \r?\n to break it in to lines
  • Now you have an array of lines, so you can edit line(i) to modify just the i-th line
  • Use strrep or regexprep to modify the contents of that line
  • Use strjoin() to join all the lines back together into a single string
  • Write that string out to your new file

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