CODEWITHSUNDEEP
bashappend
wdkrnls
wdkrnls

Reputation: 4702

How to append output in bash?

I have a shell command that produces line based output. Let me call it magic for the sake of the argument. For whatever output it produces, how can I just append another value to it? I would like to do it in a pipe. I tried for a long time to google this without any luck. It seems like I must be missing some obvious way to do it. Ideally, there would be another unix command called append which given as standard input the output of any other command the same output along with its arguments.

What I am imagining:

magic

This returns:

apple
cherry
banana

magic | append taro

This returns:

apple
cherry
banana
taro

Does this append command already exist with a different name? If so, what is it called?

Upvotes: 1

Views: 743

Answers (2)

anubhava
anubhava

Reputation: 785156

Converting my comment to answer so that solution is easy to find for future visitors.

You may use grouping of command using { ...; } to group multiple commands:

{ magic; echo 'taro'; }

And if you want to redirect output to a file then use:

{ magic; echo 'taro'; } > outfile

Upvotes: 1

Ljm Dullaart
Ljm Dullaart

Reputation: 4969

The best way is not to use a pipe, but anubhava's { magic; echo 'taro'; }.

However, since you asked a pipe, you've opened up Pandora's box of possibilities.

magic|sed '$ataro'

is the first.

magic| awk '{print} END{print "taro"}'

as second.

Or a bash function:

hop(){
    while read line; do
        echo $line
    done
    echo $1
}

magic | hop taro

And so on.

Upvotes: 1

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