columnize

columnize

Like column -t, but right justifies numerical fields, and can be configured to ignore header and footer lines for the purpose of determining field widths.

Usage

This program reads from the files specified on the command line after all the flags have been processed, or will read from standard input when no files are specified. The following two invocations will have the same effect:

$ columnize < sample.txt
$ columnize sample.txt

However, more than a single file can be provided on the command line:

$ columnize benchmarks-a.out benchmarks-b.out

Header and Footer

By default this program inspects fields on every line to determine max field width. When the --header N flag is provided, this program instead blindly copies the first N lines of input directly to its standard output without checking column widths.

Similarly, when the --footer N flag is provided, this program blindly copies the final N lines of input directly to its standard output without checking column widths.

Compare the output of the following two commands.

$ columnize testdata/bench.out
$ columnize --header 3 --footer 2 testdata/bench.out

Skip Header (deprecated: see --header flag)

The --skip-header, -s flag behaves exactly as if the --header 1 flag were provided.

Left Justify

When the -l command line option is provided, all columns will be left justified.

$ columnize -l input.txt

Right Justify

When the -r command line option is provided, all columns will be right justified.

$ columnize -r input.txt

Output Formating Delimiter

By default this program uses a minimum of two space characters between the columns in the output. The --delimiter, -d flag may be used to specify a different joining string between output columns. This string may be one or more characters.

$ columnize -d " | " input.txt

Installation

If you don't have the Go programming language installed, then you'll need to install a copy from https://golang.org/dl.

Once you have Go installed:

$ go get github.com/karrick/columnize