Shell Programming and Scripting

hello all

i have text file like this

aaa
bbb
ccc
ddd
eee
fff


i hope result like
aaa bbb
ccc ddd
eee fff

so line 1-2 is merge, 3-4 merge

if using sed/awk how do this ?

thanks

Using paste command.

Code:

paste - -< inputfile

OR with space as delimiter.

Code:

paste -d" " - -< inputfile

Code:

sed 'N;s/\n/ /' infile

Code:

awk '{getline nxt ; print $0 " " nxt}' infile

Code:

 
xargs -n2 < inputfile

If the solution needs to print the last line of a file with an odd number of lines, for most sed implementations, that will fail to print the last line. It's not my intention to disparage this solution, but I'd just like to point out that it depends on a gnu sed deviation from posix. posix states that the N command must not print the pattern space if there is not another line of input; gnu sed developers deliberately decided to break all sed scripts that use the N command when they implemented an N command whose default behavior is to always print the pattern space.

For most sed implementations (and gnu sed with the POSIXLY_CORRECT environment variable set to a non-null value), the sed script would be:

Code:

sed '$!N; s/\n/ /'

A version that should be (cannot test since I don't have a gnu sed available at this moment) portable between gnu sed's default behavior and a posixly-correct-behaving implementation:

Code:

sed '${p; d;}; N; s/\n/ /'

It's disappointing (to say the least) that gnu chose to complicate matters when there was so little to be gained.

Regards,
Alister

thank all, allready solve