append text to an output from command line

Question

I am looking to run this command

asterisk -rx "core show calls" | grep "active" | cut -d' ' -f1

it will output a number but I want it to append a "0:" at the beginning so the output looks like this

0:{output from command}

any ideas?

Ignacio Vazquez-Abrams · Accepted Answer · 2014-03-02 01:59:06Z

7

echo -n "0:" ; asterisk ......

answered Mar 2, 2014 at 1:59

Ignacio Vazquez-Abrams

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1 Comment

kojiro Over a year ago

This strikes me as the "most correct" answer, but it would be better if it showed OP enough context to see it working as a single compound command. IOW wrapped in either curly braces for redirection or $() for capturing.

iruvar · Accepted Answer · 2014-03-02 02:09:28Z

3

roll it all into awk

asterisk -rx "core show calls" | awk '/active/{print "0:"$1}'

answered Mar 2, 2014 at 2:09

iruvar

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Comments

Kostanos · Accepted Answer · 2014-03-02 02:03:34Z

0

By using sed on the end:

asterisk -rx "core show calls" | grep "active" | cut -d' ' -f1 | sed 's/^/0:/g'

by ^ in regular expression you indicate to put 0: in the beginning. You can add any text this way. Also you can add it in any other place inside a string, not only in the beginning.

answered Mar 2, 2014 at 2:03

Kostanos

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