RE: cat -n with different format? (original) (raw)

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From: Voelker, Bernhard
Subject: RE: cat -n with different format?
Date: Mon, 2 Jan 2012 11:32:22 +0100

Peng Yu wrote:

Hi,

I want to change how the line number is displayed

~$ echo a | cat -n 1 a

For example, I want it to be shown as

1:a

Although this can be easily done in anything other scripting language, I'm wondering if there is an even easier way to get it done with cat.

Additionally to the solutions using sed or nl provided by Eric and Erik, this also works:

$ seq 2 2 10 | awk '{print NR ":" $0}' 1:2 2:4 3:6 4:8 5:10 $ seq 2 2 10 | grep -n '^' 1:2 2:4 3:6 4:8 5:10

Interestingly, grep also accepts an empty empression '' but I can't find information in the manual about what grep will do in such a case: http://www.gnu.org/software/grep/manual/grep.html

$ seq 2 2 10 | grep -n '' 1:2 2:4 3:6 4:8 5:10

Have a nice day, Berny

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