[SOLVED] How to append a pattern to the previous line?

jv61 · 10-31-2013, 12:49 PM

Hello everyone,

I have a file like this

Code:

$`c1`
[1] "test1"
[2] "test2"
[3] "test3"


$`c2`
[1] "test11"
[2] "test21"

I want to append the lines that start with [] to a previous line that doesn't start with []. My result file would look something like this

Code:

$`c1` [1] "test1" [2] "test2" [3] "test3"
$`c2` [1] "test11" [2] "test21"

Any suggestions of how to do this with sed/awk?

Thanks

Robhogg · 10-31-2013, 01:35 PM

Quote:

Originally Posted by jv61

Any suggestions of how to do this with sed/awk?

Nope.

In Perl, you could do this:

Code:

perl -ne 'BEGIN {$f = 0}; chomp; print "\n" if (/^[^[]/ and $f); print "$_ "; $f = 1; END {print "\n"}' filename

Or, if you don't care about an initial blank line:

Code:

perl -ne 'chomp; print "\n" if (/^[^[]/); print "$_ "; END {print "\n"}' filename

jv61 · 10-31-2013, 01:56 PM

Thank you, that solved the problem