tr

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wikipedia:tr

Concatenate lines on a file:

cat file | tr '\n' ' '

Concatenate/merge every 2 lines:

cat /path/tofile.txt | paste -d " "  - -

cat file | tr '\n' 
tr: when not truncating set1, string2 must be non-empty

Related commands

• awk
• paste

See also

• cat, tac, more, less, tail, mtail, echo, stdin, tr, column, paste, truncate, logrotate, xzcat pv, progress, sort, ncat, virt-cat, awk, join, col, fold, tee, sponge, nfs-cat, journalctl, ccat, icat, EOF, lolcat
• file, File system, directory, touch, mkdir, ls, ln truncate, fallocate, split, stat, inode, File descriptor, superblock, block size (blockdev), fuser, lsof, scrub, chattr, ulimit (nofiles), cp, mv, file (command), mkfifo, chmod

https://stackoverflow.com/a/9605450