Remove line from text file if in the first column there is a certain character

Hi,

I have a .txt file with many rows. Short example:

$GN,074043.00,11,09,2020,00,00*

2 -0000,00 00000,00 $GN,

3 00005,00 00092,00 $GN,

4 00045,00 00042,00 $GN,

5 00005,00 00092,00 $GN,

6 00035,00 00047,00 $GN,

$GN,074136.00,11,09,2020,00,00*

7 00005,00 00092,00 $GN,

8 00025,00 00051,99 $GN,

9 00005,00 00092,00 $GN,

$GN,074152.00,11,09,2020,00,00*

10 00015,00 00056,99 $GN,

11 00005,00 00092,00 $GN,

12 00005,00 00062,01 $GN,

...

I wont to remove all lines which starting with "$" (in first column).

How can it be done?

Answer 1

[Rik]

Split the lines to cells and use a loop (or cellfun) to remove all elements where strcmp(contents(1),'$') is true. Then you can print the cell array to your file with

fprintf(fid,'%s\n',data{:});