Working with huge files in VIM

Question

I tried opening a huge   2GB  file in VIM but it choked  I don t actually need to edit the file  just jump around efficiently   How can I go about working with very large files in VIM

User · Answer

For huge one-liners  prints characters from 1 to 99    cut -c 1-99 filename

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emacs works very well with files into the 100 s of megabytes  I ve used it on log files without too much trouble   But generally when I have some kind of analysis task  I find writing a perl script a better choice

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It s already late but if you just want to navigate through the file without editing it  cat can do the job too     cat filename   less   or alternatively simple     less filename

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Since you don t need to actually edit the file    view  or vim -R  should work reasonably well on large files  Or you can use more or less

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I had a 12GB file to edit today  The vim LargeFile plugin did not work for me  It still used up all my memory and then printed an error message  -   I could not use hexedit for either  as it cannot insert anything  just overwrite  Here is an alternative approach   You split the file  edit the parts and then recombine it  You still need twice the disk space though    Grep for something surrounding the line you would like to edit   grep -n  something  HUGEFILE   head -n 1  Extract that range of the file  Say the lines you want to edit are at line 4 and 5  Then do   sed -n -e  4 5p  -e  5q  HUGEFILE  gt  SMALLPART    The -n option is required to suppress the default behaviour of sed to print everything 4 5p prints lines 4 and 5 5q aborts sed after processing line 5   Edit SMALLPART using your favourite editor  Combine the file    head -n 3 HUGEFILE  cat SMALLPART  sed -e  1 5d  HUGEFILE   gt  HUGEFILE new     i e  pick all the lines before the edited lines from the HUGEFILE  which in this case is the top 3 lines   combine it with the edited lines  in this case lines 4 and 5  and use this combined set of lines to replace the equivalent  in this case the top 5 lines  in the HUGEFILE and write it all to a new file    HUGEFILE new will now be your edited file  you can delete the original HUGEFILE

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I had the same problem  but it was a 300GB mysql dump and I wanted to get rid of the DROP and change CREATE TABLE to CREATE TABLE IF NOT EXISTS so didn t want to run two invocations of sed   I wrote this quick Ruby script to dupe the file with those changes      usr bin env ruby  matchers        q  CREATE TABLE  foo     gt   q CREATE TABLE IF NOT EXISTS  foo         q  DROP TABLE IF EXISTS  foo         gt   -- DROP TABLE IF EXISTS  foo       matchers each pair    m r      STDERR puts   s   s      m  r      STDIN each    line       STDERR puts  line   line       line chomp      unless matchers length    0         matchers each pair    m r              re    m               next if line re  nil              line sub  re r              STDERR puts  Matched    m  - gt    r               matchers delete m              break               end     puts line     Invoked like    mreplace rb  lt  foo sql  gt  foo two sql

User · Answer

this is old but  use nano  vim or gvim

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This has been a recurring question for many years    The numbers keep changing  but the concept is the same  how do I view or edit files that are larger than memory    Obviously more or less are  good approaches to merely reading the files --- less even offers vi like keybindings for scrolling and searching   A Freshmeat search on  large files  suggests that two editors would be particularly suited to your needs   One would be  lfhex     a large file hex editor  which depends on Qt    That one  obviously  entails using a GUI   Another would seem to be suited to console use  hed     and it claims to have a vim-like interface  including an ex mode     I m sure I ve seen other editors for Linux UNIX that were able to page through files without loading their entirety into memory   However  I don t recall any of their names   I m making this response a  wiki  entry to encourage others to add their links to such editors    Yes  I am familiar with ways to work around the issue using split and cat  but I m thinking of editors  especially console curses editors which can dispense with that and save us the time latencies and disk space overhead that such approaches entail

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I wrote a little script based on Florian s answer that uses nano  my favorite editor       bin sh  if        -ne 3    then   echo  Usage   0 hugeFilePath startLine endLine   gt  amp 2   exit 1 fi  sed -n -e  2    3 p  -e  3 q   1  gt  hfnano temporary file nano hfnano temporary file  head -n  expr  2 - 1   1  cat hfnano temporary file  sed -e  1   3 d   1   gt  hfnano temporary file2 cat hfnano temporary file2  gt   1 rm hfnano temporary file hfnano temporary file2   Use it like this   sh hfnano yourHugeFile 3 8   In that example  nano will open up lines 3 through 8  you can edit them  and when you save and quit  those lines in the hugefile will automatically be overwritten with your saved lines

User · Answer

Old thread  But nevertheless  pun          less filename   less works efficiently if you don t want to edit and just look around which is the case for examining huge log files   Search in less works like vi  Best part  it s available by default on most distros  So won t be problem for production environment as well

[vim] Working with huge files in VIM

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