Friday, November 19, 2021

[SOLVED] Is there a way to Combine the below two UNIX Commands in efficient manner in single piped chain of commands?

Issue

Problem Statement

  1. I would like to identify a package and its description using rpm -qi ${pkgName}.

  2. cat -n on the output of (1) will yield me which line on wards description section starts.

    Ex:- 15th Line in case atom IDE editor in rpm.

  3. I know I can solve the output and formatting part again using this line number as rpm -qi atom | awk -v n=${lineNum} 'NR>=n'. Here lineNum would be 15.

This is inefficient and I would like to use the rpm -qi command only once and then achieve this extracting out the description section on wards. Does anybody have a way to do this ?

Additional requested input

[anand@ldnpsr2937 ~]$rpm -qi atom
Name.       : atom
Version     : 1.42.0
Release     : 0.1
Architecture: x86_64
Install Date: Sun 12 Jan 2020 10:23:12 AM
Group       : Unspecified
Size        : 590646918
License     : MIT
Signature   : (none)
Source RPM  : atom-1.42.0-0.1.src.rpm
Build Date  : Sat 14 Dec 2019 03:38:56 AM
Build Host  : 2580f855e2eb
Relocations : /usr
URL         : https://atom.io/
Summary     : A hackable text editor for the 21st Century.
Description : 
A hackable text editor for the 21st Century.
[anand@ldnpsr2937 ~]$

Solution

Instead of combining something, just use rpm command to query a specific tag. No sed and fancy stuff needed at all.

rpm -q --queryformat '%{description}' atom


Answered By - Danila Vershinin
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