linux comment line in file

Whenever you want to comment a line, put a # in an appropriate place in a file. Anything beginning after # and ending at the end of the line won't get executed. This comments out the complete line.

How do I comment out a specific line in Linux?
How do I comment out a line in a file?
How do I comment an entire file in Linux?
How do you comment a line in a file in shell script?
How do you comment out a line in Unix?
How do I comment a line in crontab?
How do I comment out lines in Yaml file?
How do I comment multiple lines in conf?
How do you comment a line in nano?
How do you comment multiple lines?
What is commented out in Linux?
How do you comment all lines in Python?

How do I comment out a specific line in Linux?

add the -e argument for macOS and BSD – Jonas Drotleff Feb 25 '17 at 10:55.
To avoid commenting multiple times and taking into account multiple leading # , use the following commands: sed -i '/<pattern>/s/^#*/#/g' file (to comment out) and sed -i '/<pattern>/s/^#*//g' file (to uncomment) – Louis M May 2 '17 at 11:46.

How do I comment out a line in a file?

The Short Answer. You can “uncomment a line” in a configuration file by removing the # at the start of the line. Or, to “comment out” a line, add a # character to the start of the line. (Note that some languages have different comment formats, so this may not be true if you're working with a source code file.)

How do I comment an entire file in Linux?

Follow the steps given below for commenting multiple using the terminal.

First, press ESC.
Go to the line from which you want to start commenting. ...
use the down arrow to select multiple lines that you want to comment.
Now, press SHIFT + I to enable insert mode.
Press # and it will add a comment to the first line.

How do you comment a line in a file in shell script?

How to Comment Lines in a Bash Script? Bash comments can only be done as single-line comment using the hash character # . Every line or word starting by the # sign cause all the following content to be ignored by the bash shell.

How do you comment out a line in Unix?

You can comment by placing a octothorpe # or a : (colon) at the start of the line, and then your comment. # can also go after some code on a line to add a comment on the same line as the code.

How do I comment a line in crontab?

Syntax of crontab File Entries

Use a space to separate each field.
Use a comma to separate multiple values.
Use a hyphen to designate a range of values.
Use an asterisk as a wildcard to include all possible values.
Use a comment mark (#) at the beginning of a line to indicate a comment or a blank line.

How do I comment out lines in Yaml file?

The shortcut key combination for commenting YAML blocks is Ctrl+Q.

How do I comment multiple lines in conf?

Enter visual mode by pressing v. select the lines you like to comment ( up / down arrow or j / k ) enter :s/^/# / which translates to: in selection ( : ) replace beginning of line ( ^ ) with `# '

How do you comment a line in nano?

1 Answer. Esc 3 will comment or uncomment the selected lines in the nano editor. The default comment character used is # (valid in many scripting languages).

How do you comment multiple lines?

To block comment /* */ code:

In the C/C++ editor, select multiple line(s) of code to comment out.
To comment out multiple code lines right-click and select Source > Add Block Comment. ( CTRL+SHIFT+/ )
To uncomment multiple code lines right-click and select Source > Remove Block Comment. ( CTRL+SHIFT+\ )

What is commented out in Linux?

"Comment out" means to use comment syntax to remove something from the parsed code. "Uncomment" is the reverse operation. They are both the correct expression for their respective referents.

How do you comment all lines in Python?

Multi-line Comments in Python – Key Takeaways

Unlike other programming languages Python doesn't support multi-line comment blocks out of the box.
The recommended way to comment out multiple lines of code in Python is to use consecutive # single-line comments.