Question

How to concatenate a string and a command output in bash

Asked by: rajsan03

Hi
I want to concatenate a string and a command output in bash i.e.
x = 'hi'
y=date
echo 'x + y'
it should give me the output of date concatenated with the string 'hi'.

Please help

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Asked On
2009-09-24 at 01:28:31ID24757631
Tags

bash; shell scripting

Topics

Bourne-Again Shell (bash)

,

Shell Scripting

Participating Experts
3
Points
250
Comments
5

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Answers

 

by: woolmilkporcPosted on 2009-09-24 at 01:38:08ID: 25411107

echo ${x}${y}

 

by: woolmilkporcPosted on 2009-09-24 at 01:39:10ID: 25411112

... and to set y to the output of 'date' -

y=$(date)

 

by: nemws1Posted on 2009-09-24 at 01:39:28ID: 25411113

Not 100% sure what you want, but one of these will work for you:

# space separated
echo $x $y
# no space
echo $x$y
# combined with other text
echo The bird soared ${x}gh on:${y}
 
# Any of these can have the added braces for "safety":
echo ${x}${y}
echo ${x} ${y}
etc.

                                              
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by: woolmilkporcPosted on 2009-09-24 at 01:41:29ID: 25411118

... one more thing -

I don't see if this might be a copy-and-paste error in your Q, but please don't leave spaces around '=' when assigning variables.

x="hi"

 

by: cakuzoPosted on 2009-09-24 at 02:56:33ID: 25411459

Hi,

you can either use $(cmd) or backtickts `cmd` to get the stdout of a command
e.g.
$(date) and `date`
echo "today is: $(date)"
OUTPUT: today is Thu, Sep 24 2009 11:53am CEST

NOTE:
echo 'today is: $(date)' will NOT resolve in the date, just output as you have written it (single quote)
OUTPUT: today is $(date)

x="hi"
y=$(date)
echo "$x $y"

                                              
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20120131-EE-VQP-002

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