Rearrangement rows to columns on linux

Question

I want that rows to rearrangement to columns with spaces between the strings.

q9I6OEFg003411
q9I5IHv5006818
q9I6Gi6P024439
q9I5RoA0019541

Expected view:

q9I6OEFg003411 q9I5IHv5006818 q9I6Gi6P024439 q9I5RoA0019541

Answer 1

You can use tr to translate <newline> to <space>:

tr '\n' ' ' < file

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Also in sed:

sed -n '1h;1!H;${g;s/\n/ /g;p}' file

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In awk:

awk -vORS=' ' 1 file

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If file is small, you can use cat:

echo `cat file`

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If you know vim:

:%s/\n/ /

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maybe more ...

Answer 2

Using paste command:

paste -sd" " file

d option to set delimiter.