{"id":77,"date":"2009-11-24T16:23:00","date_gmt":"2009-11-24T21:23:00","guid":{"rendered":"http:\/\/www.rajatswarup.com\/blog\/?p=77"},"modified":"2010-02-10T23:14:44","modified_gmt":"2010-02-11T04:14:44","slug":"using-awk-with-bash-variables","status":"publish","type":"post","link":"https:\/\/www.rajatswarup.com\/blog\/2009\/11\/24\/using-awk-with-bash-variables\/","title":{"rendered":"Using awk with bash variables"},"content":{"rendered":"

I wanted to use variables in a bash script’s for loop inside awk’s print statement.
Here’s an easy way to do it – enclose the bash variable within "’"<\/p>\n

Here’s a sample scripts to take a list of IPs and do a DNS lookup and generate a CSV:<\/p>\n


for ip in `cat ips.txt`
do
  host $ip|grep -v NXDOMAIN|sed 's\/\\.$\/\/g'|awk '{print \"'\"$ip\"'\"\",\"$NF}'
done
<\/pre>\n","protected":false},"excerpt":{"rendered":"
I wanted to use variables in a bash script’s for loop inside awk’s print statement. Here’s an easy way to do it – enclose the bash variable within "’" Here’s a sample scripts to take a list of IPs and do a DNS lookup and generate a CSV: for ip in `cat ips.txt`do host $ip|grep […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[196],"tags":[207,208,209],"class_list":["post-77","post","type-post","status-publish","format-standard","hentry","category-programming","tag-awk","tag-bash","tag-parsing"],"_links":{"self":[{"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/posts\/77","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/comments?post=77"}],"version-history":[{"count":1,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/posts\/77\/revisions"}],"predecessor-version":[{"id":89,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/posts\/77\/revisions\/89"}],"wp:attachment":[{"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/media?parent=77"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/categories?post=77"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rajatswarup.com\/blog\/wp-json\/wp\/v2\/tags?post=77"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}