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darton
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Joined: 21 Jan 2006
Posts: 155
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 Posted: Fri Jun 16, 2006 5:55 pm Post subject: Deleting several lines from a textfile |
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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? |
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demond
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Joined: 12 Jun 2004
Posts: 3073
Location: San Francisco, CA
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| Posted: Fri Jun 16, 2006 11:29 pm Post subject: |
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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
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darton
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Joined: 21 Jan 2006
Posts: 155
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| Posted: Sat Jun 17, 2006 6:17 am Post subject: |
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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. |
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demond
Revered One
Joined: 12 Jun 2004
Posts: 3073
Location: San Francisco, CA
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| Posted: Sat Jun 17, 2006 10:13 pm Post subject: |
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so you are somehow reluctant to actually check out [lreplace] docs and see if it's able to delete more than one line?
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connection, sharing, dcc problems? click <here>
before asking for scripting help, read <this>
use [code] tag when posting logs, code |
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