column(1) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | HISTORY | BUGS | EXAMPLES | SEE ALSO | AVAILABILITY | COLOPHON

COLUMN(1)                     User Commands                    COLUMN(1)

NAME         top

       column - columnate lists

SYNOPSIS         top

       column [options] [file...]

DESCRIPTION         top

       The column utility formats its input into multiple columns.  The
       util support three modes:

       columns are filled before rows
              This is the default mode (required by backward
              compatibility).

       rows are filled before columns
              This mode is enabled by option -x, --fillrows

       table  Determine the number of columns the input contains and
              create a table.  This mode is enabled by option -t,
              --table and columns formatting is possible to modify by
              --table-* options.  Use this mode if not sure.

       Input is taken from file, or otherwise from standard input.
       Empty lines are ignored and all invalid multibyte sequences are
       encoded by \x<hex> convention.

OPTIONS         top

       The argument columns for --table-* options is comma separated
       list of the column names as defined by --table-columns or it's
       column number in order as specified by input. It's possible to
       mix names and numbers.

       -J, --json
              Use JSON output format to print the table, the option
              --table-columns is required and the option --table-name is
              recommended.

       -c, --output-width width
              Output is formatted to a width specified as number of
              characters. The original name of this option is --columns;
              this name is deprecated since v2.30. Note that input
              longer than width is not truncated by default.

       -d, --table-noheadings
              Do not print header.  This option allows the use of
              logical column names on the command line, but keeps the
              header hidden when printing the table.

       -o, --output-separator string
              Specify the columns delimiter for table output (default is
              two spaces).

       -s, --separator separators
              Specify the possible input item delimiters (default is
              whitespace).

       -t, --table
              Determine the number of columns the input contains and
              create a table.  Columns are delimited with whitespace, by
              default, or with the characters supplied using the
              --output-separator option.  Table output is useful for
              pretty-printing.

       -N, --table-columns names
              Specify the columns names by comma separated list of
              names. The names are used for the table header or to
              address column in option arguments.

       -l, --table-columns-limit number
              Specify maximal number of the input columns.  The last
              column will contain all remaining line data if the limit
              is smaller than the number of the columns in the input
              data.

       -R, --table-right columns
              Right align text in the specified columns.

       -T, --table-truncate columns
              Specify columns where text can be truncated when
              necessary, otherwise very long table entries may be
              printed on multiple lines.

       -E, --table-noextreme columns
              Specify columns where is possible to ignore unusually long
              (longer than average) cells when calculate column width.
              The option has impact to the width calculation and table
              formatting, but the printed text is not affected.

              The option is used for the last visible column by default.

       -e, --table-header-repeat
              Print header line for each page.

       -W, --table-wrap columns
              Specify columns where is possible to use multi-line cell
              for long text when necessary.

       -H, --table-hide columns
              Don't print specified columns. The special placeholder '-'
              may be used to hide all unnamed columns (see --table-
              columns).

       -O, --table-order columns
              Specify columns order on output.

       -n, --table-name name
              Specify the table name used for JSON output. The default
              is "table".

       -L, --keep-empty-lines
              Preserve whitespace-only lines in the input. The default
              is ignore empty lines at all. This option’s original name
              was --table-empty-lines but is now deprecated because it
              gives the false impression that the option only applies to
              table mode.

       -r, --tree column
              Specify column to use tree-like output. Note that the
              circular dependencies and other anomalies in child and
              parent relation are silently ignored.

       -i, --tree-id column
              Specify column with line ID to create child-parent
              relation.

       -p, --tree-parent column
              Specify column with parent ID to create child-parent
              relation.

       -x, --fillrows
              Fill rows before filling columns.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

ENVIRONMENT         top

       The environment variable COLUMNS is used to determine the size of
       the screen if no other information is available.

HISTORY         top

       The column command appeared in 4.3BSD-Reno.

BUGS         top

       Version 2.23 changed the -s option to be non-greedy, for example:

       printf "a:b:c\n1::3\n" | column -t -s ':'

       Old output:
       a  b  c
       1  3

       New output (since util-linux 2.23):
       a  b  c
       1     3

       Historical versions of this tool indicated that "rows are filled
       before columns" by default, and that the -x option reverses this.
       This wording did not reflect the actual behavior, and it has
       since been corrected (see above). Other implementations of column
       may continue to use the older documentation, but the behavior
       should be identical in any case.

EXAMPLES         top

       Print fstab with header line and align number to the right:
       sed 's/#.*//' /etc/fstab | column --table --table-columns SOURCE,TARGET,TYPE,OPTIONS,PASS,FREQ --table-right PASS,FREQ

       Print fstab and hide unnamed columns:
       sed 's/#.*//' /etc/fstab | column --table --table-columns SOURCE,TARGET,TYPE --table-hide -

       Print a tree:
       echo -e '1 0 A\n2 1 AA\n3 1 AB\n4 2 AAA\n5 2 AAB' | column --tree-id 1 --tree-parent 2 --tree 3
       1  0  A
       2  1  |-AA
       4  2  | |-AAA
       5  2  | `-AAB
       3  1  `-AB

SEE ALSO         top

       colrm(1), ls(1), paste(1), sort(1)

AVAILABILITY         top

       The column command is part of the util-linux package and is
       available from
       https://www.kernel.org/pub/linux/utils/util-linux/.

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found
       at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you
       have a bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2020-12-18.  (At that time, the date of the most recent commit
       that was found in the repository was 2020-12-17.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

util-linux                    February 2019                    COLUMN(1)

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