06-02-2016
Usually "thousands" of lines is not a problem for vi. Maybe you have simply not enough space in the right place: upon start vi creates a (temporary) working copy of the file it works on, usually in /var/tmp. If this is the problem you can either increase the filesystem in size or configure vi to use another location for its temporary files. How this is done depends on your vi implementation, but the man page will surely help.
If indeed vi is not working for you you might consider sed, if the changes you intend to make can be automated.
I hope this helps.
bakunin
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