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'

Add line:

• grep -qxF 'your text "additional text"' yourfile.txt || echo 'your text "additional text"' >> yourfile.txt

Activities

• Concatenate lines

Related

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

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