* [9fans] trailing newline in awk
@ 2012-01-26 12:15 dexen deVries
2012-01-26 13:17 ` hugo rivera
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: dexen deVries @ 2012-01-26 12:15 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
hi list,
can't wrap my head around this: in an awk script, how to take some action if a
file lacks last trailing Line Feed?
i want to modify files with contents like:
text LF
text LF
text
and leave undisturbed files with content like:
text LF
text LF
text LF
in other words, i want to either:
- match line that is empty and is last line of file (awk doesn't seem to take
any action on such line), or, alternatively,
- match a line that is last line of file and lacks terminating LF.
--
dexen deVries
[[[↓][→]]]
Already many of the mutants disguised as human beings are walking the streets
of Earth's cities.
-- Music Instructor, ``Electro City''
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] trailing newline in awk
2012-01-26 12:15 [9fans] trailing newline in awk dexen deVries
@ 2012-01-26 13:17 ` hugo rivera
2012-01-26 13:20 ` Steve Simon
2012-01-26 15:32 ` Jonathan Cast
2 siblings, 0 replies; 4+ messages in thread
From: hugo rivera @ 2012-01-26 13:17 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Seems impossible to do in awk, but I could be wrong. In ssam is easy:
% ssam -ne 'y/.+\n/p' file
prints the last line if it's missing the line feed.
2012/1/26 dexen deVries <dexen.devries@gmail.com>:
> hi list,
>
> can't wrap my head around this: in an awk script, how to take some action if a
> file lacks last trailing Line Feed?
>
> i want to modify files with contents like:
> text LF
> text LF
> text
>
> and leave undisturbed files with content like:
> text LF
> text LF
> text LF
>
> in other words, i want to either:
> - match line that is empty and is last line of file (awk doesn't seem to take
> any action on such line), or, alternatively,
> - match a line that is last line of file and lacks terminating LF.
>
> --
> dexen deVries
>
> [[[↓][→]]]
>
> Already many of the mutants disguised as human beings are walking the streets
> of Earth's cities.
> -- Music Instructor, ``Electro City''
>
--
Hugo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] trailing newline in awk
2012-01-26 12:15 [9fans] trailing newline in awk dexen deVries
2012-01-26 13:17 ` hugo rivera
@ 2012-01-26 13:20 ` Steve Simon
2012-01-26 15:32 ` Jonathan Cast
2 siblings, 0 replies; 4+ messages in thread
From: Steve Simon @ 2012-01-26 13:20 UTC (permalink / raw)
To: 9fans
Interesting one.
Both sed and awk has treat EOF as a line terminator
so either of these will work:
awk '{print}' junk
sed '' junk
but sam doesn't seem to regard a line without a newline as
having an end, so its not simple here:
{ echo ',x/$?\n/ c/\n/' ; echo '1,$p' } | sam -d junk >[2] /dev/null
-Steve
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] trailing newline in awk
2012-01-26 12:15 [9fans] trailing newline in awk dexen deVries
2012-01-26 13:17 ` hugo rivera
2012-01-26 13:20 ` Steve Simon
@ 2012-01-26 15:32 ` Jonathan Cast
2 siblings, 0 replies; 4+ messages in thread
From: Jonathan Cast @ 2012-01-26 15:32 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
On Thu, 2012-01-26 at 13:15 +0100, dexen deVries wrote:
> hi list,
>
> can't wrap my head around this: in an awk script, how to take some action if a
> file lacks last trailing Line Feed?
>
> i want to modify files with contents like:
> text LF
> text LF
> text
>
> and leave undisturbed files with content like:
> text LF
> text LF
> text LF
If this is all you're trying to do,
awk 1 file
works, no?
jcc
^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-01-26 12:15 [9fans] trailing newline in awk dexen deVries
2012-01-26 13:17 ` hugo rivera
2012-01-26 13:20 ` Steve Simon
2012-01-26 15:32 ` Jonathan Cast
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