Using paste command:
paste -d, -s file
file
aaa
bbb
ccc
ddd
xargs
cat file | xargs
result
aaa bbb ccc ddd
xargs improoved
cat file | xargs | sed -e 's/ /,/g'
result
aaa,bbb,ccc,ddd
Turning multiple lines into one comma separated line [duplicate]
Using paste command:
paste -d, -s file
file
aaa
bbb
ccc
ddd
xargs
cat file | xargs
result
aaa bbb ccc ddd
xargs improoved
cat file | xargs | sed -e 's/ /,/g'
result
aaa,bbb,ccc,ddd