How To Use Column Command In Linux With 10 Examples?

It also displays output data in a tabular and JSON format.

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The column is a very useful Linux command-line utility that can help you to view a single long list of output data in multiple columns in a terminal. With various options available for a column, you can also use it to format data and do more than just columnating it.

Let’s see how we can effectively use the Linux Column command in a terminal to stay more productive.

10 Ways To Use Column Command In Linux

1. Display Data In Column

Suppose you want to list all binaries from /usr/bin/, whose name starts with b. If you run the command without using column, it will give you all output in a single column.

Output without column
Output without column

Now, if you pipe the output from the last command to column utility, you can see the below output.

Output with column utility
Output with column utility

Did you see the difference column bring? Column simply distributed a single list of output into multiple columns. You can now view all output on a screen at a time without scrolling down.

If you have a long list of content in your file, then you can also use column command to display more data on a screen using the command:

$ column <filename>

2. Display Data In A Tabular Form

If you want a clear view of your input data in a tabular form where columns are delimited with whitespace or other characters, Column utility has a -t or --table option.

It creates a table by determining the number of columns input contains using a delimiter.

Display data in tabular form
Display data in tabular form

3. Delimited Output Data

Suppose you get the input data in the following form.

File data with delimiter
File data with delimiter

Now you want to view output data in a table form but with column separated by whitespace in place of “|” delimiter. You can use the column command’s -s or --separator option that separates the table column based on the delimiter you pass.

$ column <filename> -t -s "<delimiter>"
Remove delimiter
Remove delimiter

4. Output Data Separator

As you saw in the previous example, using -s option column creates a table with column separated by whitespaces. But what if you want column in the output data separated by any other character instead of the default two spaces?

For the same, Column has -o or --output-separator options that you can use to specify your column delimiter for table output.

$ column <filename> -t -s "<character-to-be-replace>" -o "<new-delimiter>"
Output Separator
Output Separator

5. Output Data With Custom Column Name

Sometimes you get input data with no column name or header that specify columns in a table.

Input data with no column name
Input data with no column name

In such a case you can use -N or --table-columns option to give logical column names separated by commas in the command line. If you specify the column name for columns that do not exist in the table, a table will still make space for it.

$ column <filename> -t --table-columns <columns-names>
Output data with header
Output data with header

6. Display Output In JSON Format

Instead of column and table format, the Linux Column utility also provides an option -J or --json to display output in JSON format.

To print JSON output, you must need to specify column name using --table-columns.

$ column <filename> -t --json --table-columns <columns>
Output data in JSON format
Output data in JSON format

As you can see in the above picture, column command gives “table” as the default name for JSON output. Using -n or --table-name, you can also give a custom table name for it.

JSON Output with table name
JSON Output with table name

7. Change Output Orientation

By default, column print output data following the column to row mode. This means, it first fills the column before rows.

Column to row output data
Column to row output data

But if you want to reverse it to fill the first rows and then columns, you can use -x or --fillrows option.

Row to column output
Row to column output

8. Show Output With Empty Lines

If your input data contains an empty line with whitespace only, it is most likely that it will be ignored by column command by default.

Input data with whitespace-only lines
Input data with whitespace-only lines

Hence, if you want to keep that lines with whitespace in the output display, you need to use -L or --table-empty-lines option.

$ column <filename> -t --table-empty-lines
Output with whitespace-only line
Output with whitespace-only line

9. Reorder Column Position

If you want to reorder the column position, the Linux column command also has an option -O or --table-order to specify column order on output.

$ column <filename> -t --table-columns <columns> --table-order <reordered-columns>
Reordered columns
Reordered columns

10. Hide Columns

Want to hide specified columns? you can use -H or --table-hide option with column command.

Hide Column
Hide Column
Sarvottam Kumar

Sarvottam Kumar

Sarvottam Kumar is a software engineer by profession with interest and experience in Blockchain, Angular, React and Flutter. He loves to explore the nuts and bolts of Linux and share his experience and insights of Linux and open source on the web/various prestigious portals.

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