How to remove execute permissions?

To remove execute permissions from a file, you can use the chmod command with the -x option. You can specify whether you want to remove execute permissions for the owner, group, or others. Here are the commands for each case:

Remove execute permission for the owner:
```
chmod u-x filename
```
Remove execute permission for the group:
```
chmod g-x filename
```
Remove execute permission for others:
```
chmod o-x filename
```
Remove execute permission for all (owner, group, and others):
```
chmod a-x filename
```

Replace filename with the name of your file. For example, if you have a script named script.sh, you would run:

chmod u-x script.sh  # To remove execute permission for the owner

You can verify the change by running:

ls -l script.sh

This will show the updated permissions for the file.