Turning Multiple Lines into One Comma Separated Line

Turning multiple lines into one comma separated line

Using paste command:

paste -d, -s file

Turning multi-line string into single comma-separated

You can use awk and sed:

awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'

Or if you want to use a pipe:

echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/'

To break it down:

• awk is great at handling data broken down into fields
• -vORS=, sets the "output record separator" to ,, which is what you wanted
• { print $2 } tells awk to print the second field for every record (line)
• file.txt is your filename
• sed just gets rid of the trailing , and turns it into a newline (if you want no newline, you can do s/,$//)

How to concatenate multiple lines of output to one line?

Use tr '\n' ' ' to translate all newline characters to spaces:

$ grep pattern file | tr '\n' ' '

Note: grep reads files, cat concatenates files. Don't cat file | grep!

Edit:

tr can only handle single character translations. You could use awk to change the output record separator like:

$ grep pattern file | awk '{print}' ORS='" '

This would transform:

one
two 
three

to:

one" two" three" 

How to convert multiple words in single line separated by comma in list of multiple lines

echo "your string" |tr \[ ' '|tr \] ' '|tr , \\n|awk '{$1=$1};1'

Explanation

• echo "your string" prints your string, then piped to the next tr
• tr \[ ' ' substitutes [ with an empty space
• tr \] ' ' substitutes ] with an empty space
• tr , \\n substitutes the comma with a newline
• awk '{$1=$1};1' (taken from here) trims spaces

How to join multiple lines of file names into one with custom delimiter?

Similar to the very first option but omits the trailing delimiter

ls -1 | paste -sd "," -

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