How to edit specific lines of a large text file?

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Ehsan Fatourehchi
Ehsan Fatourehchi 2017-3-24
编辑： Ehsan Fatourehchi 2017-4-7
Hi all, I have a large text file, about 7000 lines, and I need to read and edit specific lines, 300 lines, in the middle of the file. How can I skip unneeded lines?
  2 个评论
ES
ES 2017-3-24
Some more details?
Do you know which specific line number, line content you should start editing?
Ehsan Fatourehchi
Ehsan Fatourehchi 2017-3-24
Yes, I need to edit lines from 6600 to 6900. The start word of these lines is TEMP.

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dbmn
dbmn 2017-3-24
If you already know the line number that you need to edit, I suggest to use one of the following solutions on matlabcentral https://de.mathworks.com/matlabcentral/answers/62986-how-to-change-a-specific-line-in-a-text-file
https://de.mathworks.com/matlabcentral/answers/38300-how-to-make-a-small-change-to-a-big-text-file-efficiently
If you dont know your line number yet, but know some test-marker (f.ex. TEMP....TEMP) you can read on the Matlab functions
regexprep
regexp
or check out this answer
https://de.mathworks.com/matlabcentral/answers/164931-how-to-parse-information-between-two-strings-using-regular-expressions
hope this helps.
  1 个评论
Ehsan Fatourehchi
Ehsan Fatourehchi 2017-4-7
编辑：Ehsan Fatourehchi 2017-4-7
Thank you and Walter Roberson. I have finally made it by doing the following procedure: Identity the byte offsets of the values which needs to be changed. Then, each time, fopen asking for 'r+' access. fseek to the position, fwrite the new content, fclose. Since I have 900 different values to change, I created a matrix for byte offsets of the values beforehand.

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