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

Thanks for the awk solution, I'm still a beginner with bash. What I actually don't understand is why while replacing the last grep command, without using any other trick like double quotes, filename is printed correctly. What I've seen till now is that redirection of stdout into a file always work, also with empty stdout.

Shred
– Shred

2018-06-13 10:16:45 +00:00
Commented Jun 13, 2018 at 10:16
@Shred Yes, any redirection with > creates the output file (or empties it if it exists) before the command is even started (if the output file is writable at all).

Kusalananda
– Kusalananda ♦

2018-07-09 07:45:22 +00:00
Commented Jul 9, 2018 at 7:45

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 »