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up vote 3 down vote favorite

For example, I got from some command some lines

$ some-command
John
Bob
Lucy

Now I'd like to add chaining command, that modifies output.

$ some-command | other-command
Hi John Bye
Hi Bob Bye
Hi Lucy Bye

How to write other-command? (I'm a novice in bash)

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2 Answers

up vote 6 down vote

awk

$ some-command | awk '{print "Hi "$1" Bye"}'

sed

$ some-command | sed 's/\(.*\)/Hi \1 Bye/'

Examples

Using awk:

$ echo -e "John\nBob\nLucy" | awk '{print "Hi "$1" Bye"}'
Hi John Bye
Hi Bob Bye
Hi Lucy Bye

Using sed:

$ echo -e "John\nBob\nLucy" | sed 's/\(.*\)/Hi \1 Bye/'
Hi John Bye
Hi Bob Bye
Hi Lucy Bye
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up vote 3 down vote

The code below reads line after line, storing it in variable LINE. Inside the loop, each line is written back to the standard output, with the addition of "Hi" and "Bye"

#!/bin/bash

while read LINE ; do
   echo "Hi $LINE Bye"  
done
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