Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Handy awk commands

Oracle Database Tips by Donald BurlesonDecember 13,  2015


Using UNIX tools such as sed (string editor) and awk (named after Aho, Weinberg and Kernigan) are indispensible skills for the Oracle professional on UNIX and Linux.

In addition, Oracle shell scripting is required for effective file manipulation as described in the book "Oracle Shell Scripting" by Oracle guru Jon Emmons.

This great web page shows awk in-action, dozens of handy awk commands for easy file manipulation in UNIX and Linux.  Here are my favorites:

Substitute (find and replace) "foo" with "bar" on each line.

awk '{ sub(/foo/,"bar"); print }'

(Note:  You can also do this change all in vi with sed (invoked with "s"), like this:


Change "scarlet" or "ruby" or "puce" to "red".

awk '{ gsub(/scarlet|ruby|puce/, "red"); print}'

Remove duplicate, consecutive lines (emulate "uniq")

awk 'a !~ $0; { a = $0 }'

Convert Windows/DOS newlines (CRLF) to Unix newlines (LF) from Unix.

awk '{ sub(/\r$/,""); print }'

Convert Unix newlines (LF) to Windows/DOS newlines (CRLF) from Unix.

awk '{ sub(/$/,"\r"); print }'

Delete leading whitespace (spaces and tabs) from the beginning of each line (ltrim).

awk '{ sub(/^[ \t]+/, ""); print }'

Delete trailing whitespace (spaces and tabs) from the end of each line (rtrim).

awk '{ sub(/[ \t]+$/, ""); print }'

Delete both leading and trailing whitespaces from each line (trim).

awk '{ gsub(/^[ \t]+|[ \t]+$/, ""); print }'

Insert 5 blank spaces at beginning of each line.

awk '{ sub(/^/, "     "); print }'




Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.