How to replace ${} placeholders in a text file?
I want to pipe the output of a “template” file into MySQL, the file having variables like ${dbName} interspersed. What is the command … Read more
text-processing
How to convert all text to lowercase in Vim
How do you convert all text in Vim to lowercase? Is it even possible? 10 Answers 10
Using multiple delimiters in awk
I have a file which contain following lines: /logs/tc0001/tomcat/tomcat7.1/conf/catalina.properties:app.env.server.name = demo.example.com /logs/tc0001/tomcat/tomcat7.2/conf/catalina.properties:app.env.server.name = quest.example.com /logs/tc0001/tomcat/tomcat7.5/conf/catalina.properties:app.env.server.name = www.example.com In above output I want to … Read more
How to use sed to replace only the first occurrence in a file?
I would like to update a large number of C++ source files with an extra include directive before any existing #includes. For this … Read more
Select random lines from a file
In a Bash script, I want to pick out N random lines from input file and output to another file. How can this … Read more
Add a prefix string to beginning of each line
I have a file as below: line1 line2 line3 And I want to get: prefixline1 prefixline2 prefixline3 I could write a Ruby script, … Read more
How can I extract a predetermined range of lines from a text file on Unix?
I have a ~23000 line SQL dump containing several databases worth of data. I need to extract a certain section of this file … Read more