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Using awk:

$ awk '{if (NR>1) print a "," OFS; a=$0}END {if (NR) print ""}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file

Using AWK:

$ awk 'NR>1{printf "%s", a "," OFS} {a=$0}END {print a}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file

Using awk:

$ awk 'a{printf "%s", a ", "}{a=$0}END{print a}'

But the above command prints a line with an empty file. This can be modified to this:

$ awk '{if (a) printf "%s", a "," OFS; a=$0}END {if (NR) print a}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file

Using awk:

$ awk '{if (NR>1) print a "," OFS; a=$0}END {if (NR) print ""}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file

Using awk:

$ awk 'a{printf a ", "}{a=$0}END{print a}'

But the above command prints a line with an empty file. This can be modified to this:

$ awk '{if (a) printf a "," OFS; a=$0}END {if (NR) print a}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file

Using awk:

$ awk 'a{printf "%s", a ", "}{a=$0}END{print a}'

But the above command prints a line with an empty file. This can be modified to this:

$ awk '{if (a) printf "%s", a "," OFS; a=$0}END {if (NR) print a}'

If only comma is needed without space and all records have only one fields, then datamash may be used.

$ datamash -W collapse 1 <file