Edit - Unix & Linux Stack Exchange

You are not logged in. Your edit will be placed in a queue until it is peer reviewed.

We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

Required fields*

Rev

4

If you're doing this with huge files, then the memory constraints of loading a huge file into an associative array are going to be prohibitive.

Charles Duffy
– Charles Duffy

2016-06-17 14:01:05 +00:00
Commented Jun 17, 2016 at 14:01
@CharlesDuffy, that would be a lot worse with grep -Fvxf approach though, where the performance would be unacceptable long before memory exhaustion.

Stéphane Chazelas
– Stéphane Chazelas

2024-01-20 12:29:46 +00:00
Commented Jan 20, 2024 at 12:29
@StéphaneChazelas, indeed; for really large files one really ought to use sort+comm, where better sort implementations' ability to generate temporary files and merge-sort them together means that memory constraints are moot. (Of course, keeping content pre-sorted to the extent possible is in this context a Very Good Idea)

Charles Duffy
– Charles Duffy

2024-01-20 17:57:32 +00:00
Commented Jan 20, 2024 at 17:57

Add a comment |

Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

formatting help »
answering help »