Remove Characters From the End of a Large File
This page answers questions like these:
- How to remove characters from the end of a text file?
- How to remove characters from the end of a large file?
- How to remove characters from the end of a huge file?
- How to remove characters from the end of a massive file?
- How to remove characters from the end of a enormous file?
Related Links:
Remove Characters From the End of a Binary File
Remove Characters From the Start of a Binary File
Remove Characters From the Start of a Large File
Count Occurrences of a Hexadecimal Sequence in a File
Count Occurrences of a String in a File
Find Positions of a Hexadecimal Sequence in a File
Join Lines of Text File Together
Output Lines of a File in Reverse Order
Output the Lines Between Two Matching Lines
Sed Cannot Rename Temporary File Permission Denied
Remove Characters From the End of a Large File:
truncate -s FILESIZE FILE ...
- Resize each file to be exactly size FILESIZE bytes.
- Pros: Works for both text and binary files.
- Cons: Some systems don’t have the truncate command.
- Caveats: If resizing up, the new bytes will be set to zero.
dd if=FILE1 of=FILE2 bs=FILESIZE2 count=1
- Copy FILESIZE2 characters from existing file FILE1 to new file FILE2.
- Pros: Works for both text and binary files.
- Cons: If the bs parameter is huge, you may run out of memory on some systems.
If FILESIZE2 is not prime, factorizing it and putting the product of some of the factors into the bs parameter and the product of the rest of the factors into the count parameter may alleviate this problem.
Note that, if the count parameter is huge, the command will run very slowly, for example, running dd if=FILE1 of=FILE2 bs=1 count=FILESIZE2 would never run out of memory but it would run extremely slowly on huge files.
Remove the Last Few Characters From the Last Line of a Large Text File:
sed -i '$s/.\{3\}$//' FILE
- Remove the last 3 characters from the last line of text file FILE.
- Pros: Can do regular expression matching and substitution.
- Cons: Doesn’t work for binary files.
- Caveats: This example doesn’t work if the last line has less than 3 characters.
Related Links:
Remove Characters From the End of a Binary File
Remove Characters From the Start of a Binary File
Remove Characters From the Start of a Large File
Count Occurrences of a Hexadecimal Sequence in a File
Count Occurrences of a String in a File
Find Positions of a Hexadecimal Sequence in a File
Join Lines of Text File Together
Output Lines of a File in Reverse Order
Output the Lines Between Two Matching Lines
Sed Cannot Rename Temporary File Permission Denied
Home > Linux / Unix > Remove Characters From the End of a Large File
Tags: remove characters from end, text file, huge file, large file, massive file, enormous file, long file, linux, unix, solaris, bsd, aix
Copyright © HelpDoco.com
file-remove-characters-from-end-of-large-file.txt
Linux-Unix/remove-characters-from-end-of-large-file.htm
2