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Print multiple fields with awk

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# 1  
Old 11-08-2016
Print multiple fields with awk
so its common knowledge one can print multiple fields with simple commands like this:

Code:
echo 12 44 45 552 24 | awk '{print $1,$4,$3}'

but suppose i want to avoid specifying the "$" symbol. is that possible? can something like this be done:

Code:
echo 12 44 45 552 24 | awk '{print $(1,4,3)}'

when i run the above, i get this:

Code:
awk: cmd. line:1: {print $(1,4,3)}
awk: cmd. line:1:           ^ syntax error
awk: cmd. line:1: {print $(1,4,3)}
awk: cmd. line:1:               ^ syntax error

# 2  
Old 11-08-2016
So you want awk to be re-written because you don't want to follow the published syntax?

Is this perhaps because you want to pass in/deduce the fields you want as variables rather than hard coding them?


Please can you elaborate a bit more.


Thanks, in advance,
Robin
# 3  
Old 11-08-2016
No, that cannot be done that way. What do you want to achieve? What do you mean with avoiding the "$" symbol?
# 4  
Old 11-08-2016
Hi,

Not sure your intention.

I doubt it is possible to get fileds without $ in awk.

If you are sure with your input content, below experimental one works:
Code:
echo "12 44 45 552 24" | sed -e 's/^\([0-9]\{2\}\) \([0-9]\{2\}\) \([0-9]\{2\}\) \([0-9]\{2,3\}\) \([0-9]\{2\}\)/\1 \4 \3/'

Gives output:
Quote:
12 552 45
This User Gave Thanks to greet_sed For This Post:
SkySmart
# 5  
Old 11-08-2016
Quote:
Originally Posted by Scrutinizer
No, that cannot be done that way. What do you want to achieve? What do you mean with avoiding the "$" symbol?
so the fields to be grabbed from an output has to be provided by the user.

if i'm following the regular way of specifying the fields, it leaves no room for the users to specify the field.

for instance -

Code:
enter the fields you wish to grab: 1,3,4,8
read usersresponse

echo 4 2 45 48 25 98 100 87 372 731 93 | awk '{print $('${usersresponse}')}'

basically, im looking for the simplest way to get the fields provided by the user into a recognizable format to awk.
# 6  
Old 11-08-2016
Code:
echo 12 44 45 552 24 | awk -vCOLS="1,4,3" '{for (i=1; i<=split(COLS,T,","); i++) printf "%s" OFS, $T[i]; printf RS}'
12 552 45

This User Gave Thanks to RudiC For This Post:
SkySmart
# 7  
Old 11-08-2016
Quote:
Originally Posted by RudiC
Code:
echo 12 44 45 552 24 | awk -vCOLS="1,4,3" '{for (i=1; i<=split(COLS,T,","); i++) printf "%s" OFS, $T[i]; printf RS}'
12 552 45


suppose i want to also be able to specify what field to grab, counting from the right hand side?

for instance, if i want to grab the value in the last column, i'll use NF. But suppose i want to grab the value in column that is 2 columns from the right:

Code:
echo 12 44 45 552 24 | awk -vCOLS="1,4,3,NF-2" '{for (i=1; i<=split(COLS,T,","); i++) printf "%s" OFS, $T[i]; printf RS}'
12 552 45
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