请帮助修改Linux中的Shell脚本

Question

I have a shell script that do the following task:

1. extract the tags(name,owner,cost.centre) from ec2-describe-instances commands and write this detail to a file.
2. Also finds the instances whose any above mentioned tag is missing and write the data in another file.

Any lead is appreciated

Answer 1

Forget yours, I have recommended to use 2-d array in awk to simplify the code.

Here is the updates from your previous question ( Error in shell script and how to write to a file )

awk 'BEGIN{print "Instance id           Name                      Owner         Cost.centre"}
/TAG/{split($0,a,FS);a[4]=tolower(a[4]);$1=$2=$3=$4="";b[a[3],a[4]]=$0;c[a[3]]}
END{for (i in c) printf "%-18s%-26s%-14s%-20s\n",i,b[i,"name"]==""?"Unknown":b[i,"name"],b[i,"owner"]==""?"Unknown":b[i,"owner"],b[i,"cost.center"]==""?"Unknown":b[i,"cost.center"]}' file