Removing Blank Lines Using the Grep Command
In this tutorial, we'll explore how to utilize the grep command to eliminate blank lines. The grep command proves invaluable for searching text and strings within files, providing efficient ways to manage content. Learn the process of removing unwanted blank lines with ease and precision.
For example 1
The content grep_command.txt file is as follows:
welcome to huuphan.comThe result,
I'm Huu
[server@xxx$]
other web site devopsroles.com
[server@xxx$]
[server@xxx$] test
Tip tip
welcome to huuphan.comUse command below:
I'm Huu
other web site devopsroles.com
Tip tip
grep -v "\$[[:space:]]*" grep_command.txt
The output terminal as below:
For example 2
The content grep_command2.txt file as below
phan
van
huu
The result,
phan
van
huu
Use command as below:
grep -v "^[[:space:]]*$" grep_command2.txt
# or
grep -v "^$" grep_command2.txt
The output terminal as below:
Explained
The -v makes it print lines that do not completely match^ match start of line
[[:space:]] match whitespace- spaces, tabs, carriage returns, etc.
* previous match (whitespace) may exist from 0 to infinite times
$ match end of line
In conclusion, mastering the grep command enables efficient text searching and manipulation, making it a valuable tool in a developer's arsenal. Whether it's removing blank lines or performing complex pattern matching, grep streamlines tasks and boosts productivity. Embrace its capabilities to enhance your command-line proficiency. I hope will this your helpful. Thank you for reading the huuphan.com page!
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