Line

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wikipedia:line

Count lines:

• wc -l

Concatenate lines:

• cat file | tr '\n' ' '
• cat file | xargs
• ls | xargs

New line:

• echo

Merge every two lines:

• cat /path/tofile.txt | paste -d " " - -
• cat /path/tofile.txt | xargs -n2 -d'\n'

Activities

• Concatenate lines

Related

• spit
• column
• uniq
• echo -n
• Remove first line: tail -n +2
• grep .
• Cisco IOS: line vty

See also

• line, newline, characters, wc, column, Add line, Concatenate lines, Ansible: lineinfile, rpl, sed -i
• 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