How do I comment in a Unix shell script?

How do I comment in a Unix shell script?

A single-line comment starts with hashtag symbol with no white spaces (#) and lasts till the end of the line. If the comment exceeds one line then put a hashtag on the next line and continue the comment. The shell script is commented out prefixing # character for single-line comment.

How do you comment in a script?

You can insert comments and remarks in the script code, or deactivate parts of the script code by using comment marks. All text on a line that follows to the right of // (two forward slashes) will be considered a comment and will not be executed when the script is run.

How do I comment on a Linux script?

Comments can be added at the beginning on the line or inline with other code:

1. # This is a Bash comment.
2. # if [[ $VAR -gt 10 ]]; then # echo “Variable is greater than 10.” # fi.
3. # This is the first line.
4. << ‘MULTILINE-COMMENT’ Everything inside the HereDoc body is a multiline comment MULTILINE-COMMENT.

How do you comment out a line in Linux?

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. This comments out only the last part of the line starting at #.

How do you comment multiple lines in a shell script?

In Shell or Bash shell, we can comment on multiple lines using << and name of comment. we start a comment block with << and name anything to the block and wherever we want to stop the comment, we will simply type the name of the comment.

How do you comment multiple lines in Linux?

Commenting Multiple Lines

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

How do you comment a line using sed?

There is an option to write sed ‘/^#/! {/BBB/ s/^/#/}’ which will work way better but my initial solution is way more simple as long as you know its limitation. How to escape this if we are using above in java program? Like this: sed -e ‘/BBB/ s|^(//)*|//|’ -i file .

How do you comment multiple lines in Unix?

How do you comment multiple lines?

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+\ )

How do I comment out a line in a file?

How comment multiple lines sed?

3 Answers

1. /^\s*log.*;$/ s|^|//| If the line starts with log and ends with ; then substitute the start, ^ with //
2. /\s*^log/, /);$/ s|^|//|” /^log/, /);$/ This is an address range. For all lines within this range, the substitution is performed. The range of lines start from the first regex match to the end match.

How do you write a multi line comment in shell script?

How to comment lines between two line numbers in shell script?

You can use sed command to comment lines between two line numbers. Example: sed -i ‘10,30 s/^/#&/’ mycode.sh Above code will comment the code between line 10&30. Unix Shell Scripts «Prev Next»

What is a comment in a shell script?

A comment in a script is any line that begins with a hash mark (also called a pound sign): #. When the shell finds a # character, everything until the end of the line is ignored. In a large shell script, a block of comment lines are often used to introduce a section of the script, something like this:

Is there a way to un-comment a section of a script?

You can comment section of a script using a conditional. In order to uncomment the section of the code, you simply need to comment the variable: (Doing so would print the numbers 1 through 7.) Yes (although it’s a nasty hack).

How to comment lines between two line numbers in sed command?

You can use sed command to comment lines between two line numbers. Example: Above code will comment the code between line 10&20. 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.