[9fans] trailing newline in awk

[dexen deVries]

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.

[hugo rivera]

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.

Post by dexen deVries
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?
text LF
text LF
text
text LF
text LF
text LF
 - 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''

[Steve Simon]

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

[Jonathan Cast]

Post by dexen deVries
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?
text LF
text LF
text
text LF
text LF
text LF

If this is all you're trying to do,

awk 1 file

works, no?

jcc