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How can I assign awk's variable to shell script's variable?

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# 1  
Old 05-23-2018
Question How can I assign awk's variable to shell script's variable?
I have the following script, and I want to assign the output ($10 and $5) from awk to N and L:
Code:
grdinfo data.grd | awk '{print $10,$5}'| read N L

output from gridinfo data.grd is: data.grd 50 100 41 82 -2796 6944 0.016 0.016 3001 2461. where N and L is suppose to be 3001 and 100. I use bash shell.

How can I achieve this? Thanks.
# 2  
Old 05-23-2018
Welcome to the forum.


Depending on your bash version, there are different options:
- shopt -s lastpipe; set +m

- read N L <<< $(grdinfo data.grd | awk '{print $10,$5}')


- read N L <<EOF
$(grdinfo data.grd | awk '{print $10,$5}')
EOF


or simply read X X X X L X X X X N <<< $(grdinfo data.grd)
Last edited by RudiC; 05-23-2018 at 03:12 PM..
This User Gave Thanks to RudiC For This Post:
geomarine
# 3  
Old 05-23-2018
Code:
eval $(grdinfo data.grd | awk '{printf("N=%s%sL=%s\n", $10,OFS,$5)}')
echo "N->[${N}] L->[${L}]"

Last edited by vgersh99; 05-23-2018 at 04:11 PM.. Reason: ooops
These 2 Users Gave Thanks to vgersh99 For This Post:
geomarine RudiC
# 4  
Old 05-23-2018
Thanks vgersh99 and RudiC. My bash version is: GNU bash, version 4.3.46(7)-release (x86_64-unknown-cygwin)
# 5  
Old 05-23-2018
@vgersh99: although I really love this creative approach, I'm afraid there's a leading $ sign missing in the "command substitution"?
These 2 Users Gave Thanks to RudiC For This Post:
geomarine vgersh99
# 6  
Old 05-23-2018
Thanks. I don't know were '$' is missing. can you please point that out? I also found out that '<<<' represent 'here'.
Code:
read N L <<< $(grdinfo data.grd | awk '{print $10,$5}')

what is the implication of "<<<" and how can I test the output from this command line? I tried:
Code:
read N L <<< $(grdinfo data.grd | awk '{print $10,$5}')
echo N L

Last edited by Corona688; 05-23-2018 at 03:55 PM..
# 7  
Old 05-23-2018
Use code tags for code please.

Try
Code:
read N L <<< $(grdinfo data.grd | awk '{print $10,$5}')
echo $N $L

This User Gave Thanks to Corona688 For This Post:
geomarine
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