egghelp/eggheads community

Deleting several lines from a textfile

2006-06-17T22:13:06-04:00

so you are somehow reluctant to actually check out [lreplace] docs and see if it's able to delete more than one line?

Statistics: Posted by demond — Sat Jun 17, 2006 10:13 pm

Deleting several lines from a textfile

2006-06-17T06:17:45-04:00

I know how to delete one line. On this forum there is a tutorial for it:

Code:

# Use the code from above (1.) to read in all the lines from the file.# We continue right after: set lines [split $data "\n"]# We'll delete the first line.set line_to_delete 0# If you wanted to delete the last line instead, you would do this:# set line_to_delete [expr [llength $lines] - 1]# Now, we remove the line from the list in memory first.set lines [lreplace $lines $line_to_delete $line_to_delete]# And finally, we re-write the file with the new data.set fp [open $fp "w"]puts $fp [join $lines "\n"]close $fp

But here only one line is deleted. What do I have to change that all lines from the second till the end are deleted.

Statistics: Posted by darton — Sat Jun 17, 2006 6:17 am

Deleting several lines from a textfile

2006-06-16T23:29:40-04:00

after so many requests for help, you should have known by now that any manipulation of text files is best done in memory - that is, you read the entire file into a list, manipulate the list, and write it back to disk file

Statistics: Posted by demond — Fri Jun 16, 2006 11:29 pm

Deleting several lines from a textfile

2006-06-16T17:55:25-04:00

Hello!
I made a script but now I can't get on because I don't know how to delete all lines except for the first. That means I need a code that deletes all lines from the second till the end. Can anybody help me?

Statistics: Posted by darton — Fri Jun 16, 2006 5:55 pm