Double-space a file perl -pe ‘$\ = “\n”‘ file Double-space a file, excluding the blank lines perl -pe ‘$_ .= “\n” unless /^$/’ Add a blank line before every line perl -pe ‘s/^/\n/’ Remove all blank lines perl -ne ‘print unless /^$/’
First of all my apologies, I haven’t realized that my email posts changed from full posts to excerpt mode while changing some other feeder settings. Now, I have changed the posts to full content mode again, to let you read entire post from your inbox comfortably....
What is Automation? Automation is nothing but performing system administration tasks without manual interventions, and complete the operations using specific tools/programs/scripts. Example: Writing a script to backup the data from one server and run it using cron scheduler on every night. Why the Automation is important...
by Ramdev · Published September 3, 2015 · Last modified September 11, 2015
Awk and Gawk – pattern scanning and processing language Gawk is the GNU Project’s implementation of the AWK programming language. It conforms to the definition of the language in the POSIX 1003.1 Standard. This version in turn is based on the description in The AWK Programming...
Recent Posts / Scripting / Unix Intermediate
by Ramdev · Published March 13, 2016 · Last modified March 11, 2016
Often, you’ll find yourself trying to evaluate a variable’s value, looking for a specific value within a set of possible values. In this scenario, you end up having to write a lengthy if-then-else statement, like this:
The if-then statement allows you to use Boolean logic to combine tests. You can use these two Boolean operators: [ condition1 ] && [ condition2 ] [ condition1 ] || [ condition2 ] The first Boolean operation uses the AND Boolean operator to combine two conditions....
Recent Posts / Scripting / Unix Intermediate
by Ramdev · Published March 19, 2016 · Last modified August 5, 2016
You might be tempted to think that after you start a loop, you’re stuck until the loop finishes all its iterations. This is not true. A couple of commands help us control what happens inside of a loop: The break command The continue command Each command...
Recent Posts / Scripting / Unix Intermediate
by Ramdev · Published March 1, 2016 · Last modified July 23, 2016
To place shell commands in a text file, first you need to use a text editor to create a file and then enter the commands into the file. When creating a shell script file, you must specify the shell you are using in the first line...
Most shell commands produce their own output, which is displayed on the console monitor where the script is running. Many times, however, you will want to add your own text messages to help the script user know what is happening within the script. You can do...
So far in our sample scripts, we terminated things pretty abruptly. When we were finished with our last command, we just ended the script. There’s a more elegant way of completing things available to us. Every command that runs in the shell uses an exit status...
[contact-form to='ramkumar.ramadevu@gmail.com' subject='New Learning Request Submitted'][contact-field label='Name' type='name' required='1'/][contact-field label='Email' type='email' required='1'/][contact-field label='Learning Request' type='textarea' required='1'/][contact-field label='Are you Looking for ' type='radio' required='1' options='Paid Training,Free Training'/][/contact-form]
