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Top Forums Shell Programming and Scripting Bash for loop with awk and variables Post 302913336 by lily-anne on Friday 15th of August 2014 11:13:54 AM

08-15-2014

Registered User

Bash for loop with awk and variables

I'm relatively new to bash scripting and am trying to use awk inside a bash for loop but am having a problem with the variables.

Code:

for i in $(seq 30 5 60)
do

# Define variables up and down in AWK
eval $(awk 'BEGIN{ print "up=$((i+1))"}' < /dev/null)
eval $(awk 'BEGIN{ print "down=$((i-1))"}' < /dev/null)
echo $up
echo $down

# Print the longitude ($2) if the lattitude ($1) is between i =+/-1 and the age ($3) is less than 5
awk '{if ($1<$up && $1>$down && $3<5) print $2}' SWIR_age.xya > junk

# Display the profile number and average longitude
echo Profile $i
cat junk | awk '{sum+=$1} END {print sum/NR}'

done

# Remove junk
find . -name junk\* -exec rm {} \;

The echo command reads out the variables correctly but the next awk command can't read them. I've tried having the variables with and without the $ to no avail.

I'd also like to print all of this to a file at the end with the first column being profile$i and the second being the final value of sum/NR but again I am not sure how to do this.

Thanks,
Lily

lily-anne

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LEARN ABOUT OPENSOLARIS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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