Turning multiple lines into one comma separated line [duplicate]

Answer 1

based on your input example, this awk line works. (without trailing comma)

awk -vRS="" -vOFS=',' '$1=$1' file

test:

kent$  echo "foo
bar
qux
zuu
sdf
sdfasdf"|awk -vRS="" -vOFS=',' '$1=$1' 
foo,bar,qux,zuu,sdf,sdfasdf

Answer 2

file

aaa
bbb
ccc
ffffd

xargs

cat file | xargs

result

aaa bbb ccc ffffd 

xargs improoved

cat file | xargs | sed -e 's/ /,/g'

result

aaa,bbb,ccc,ffffd 

Answer 3

There are many ways it can be achieved. The tool you use mostly depends on your own preference or experience.

Using tr command:

tr '\n' ',' < somefile

Using awk:

awk -F'\n' '{if(NR == 1) {printf $0} else {printf ","$0}}' somefile

Answer 4

xargs -a your_file | sed 's/ /,/g'

This is a shorter way.

Answer 5

Perl one-liner:

perl -pe'chomp, s/$/,/ unless eof' file

or, if you want to be more cryptic:

perl '-peeof||chomp&&s/$/,/' file

Answer 6

Using paste command:

paste -d, -s file