$ curl cheat.sh/
 cheat:paste 
# To concat columns from files:
paste <file>...

# To list the files in the current directory in three columns:
ls | paste - - -

# To combine pairs of lines from a file into single lines:
paste -s -d '\t\n' <file>

# To number the lines in a file, similar to nl(1):
sed = <file> | paste -s -d '\t\n' - -

# To create a colon-separated list of directories named bin, suitable for use in the PATH environment variable:
find / -name bin -type d | paste -s -d : -

 tldr:paste 
# paste
# Merge lines of files.

# Join all the lines into a single line, using TAB as delimiter:
paste -s file

# Join all the lines into a single line, using the specified delimiter:
paste -s -d delimiter file

# Merge two files side by side, each in its column, using TAB as delimiter:
paste file1 file2

# Merge two files side by side, each in its column, using the specified delimiter:
paste -d delimiter file1 file2

# Merge two files, with lines added alternatively:
paste -d '\n' file1 file2

$
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