How do you comment a cron job in UNIX?

Syntax of crontab File Entries

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

Run “vi /etc/crontab”, arrow down to each line you wish uncommented and press “x” to delete the #. If you make a mistake, press “u” to undo it. When done, type “:wq” to exit vi.

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.

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.

8 мар. 2020 г.

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.

26 февр. 2020 г.

Where is crontab file located?

In Red Hat based distributions such as CentOS, crontab files are stored in the /var/spool/cron directory, while on Debian and Ubuntu files are stored in the /var/spool/cron/crontabs directory. Although you can edit the user crontab files manually, it is recommended to use the crontab command.

How do I edit crontab?

How to Create or Edit a crontab File

1. Create a new crontab file, or edit an existing file. $ crontab -e [ username ] …
2. Add command lines to the crontab file. Follow the syntax described in Syntax of crontab File Entries. …
3. Verify your crontab file changes. # crontab -l [ username ]

To create a single line comment in JavaScript, you place two slashes “//” in front of the code or text you wish to have the JavaScript interpreter ignore. When you place these two slashes, all text to the right of them will be ignored, until the next line.

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 create a shell script?

Let us understand the steps in creating a Shell Script:

1. Create a file using a vi editor(or any other editor). Name script file with extension . sh.
2. Start the script with #! /bin/sh.
3. Write some code.
4. Save the script file as filename.sh.
5. For executing the script type bash filename.sh.

2 мар. 2021 г.

yaml files), you can comment-out multiple lines by:

1. selecting lines to be commented, and then.
2. Ctrl + Shift + C.

17 февр. 2010 г.

To block comment /* */ code:

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

Multi-line Comments in Python – Key Takeaways

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