paste

Merge lines of files. More information: https://www.gnu.org/software/coreutils/paste.

• Join all the lines into a single line, using TAB as delimiter:

paste -s path/to/file

• Join all the lines into a single line, using the specified delimiter:

paste -s -d delimiter path/to/file

• Merge two files side by side, each in its column, using TAB as delimiter:

paste path/to/file1 path/to/file2

• Merge two files side by side, each in its column, using the specified delimiter:

paste -d delimiter path/to/file1 path/to/file2

• Merge two files, with lines added alternatively:

paste -d '\n' path/to/file1 path/to/file2