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Full Discussion: Bash for loop with awk and variables
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
Old 08-15-2014
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
 

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LEARN ABOUT CENTOS

bashbug-64

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
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