You can use touch -c option to not create any new file if it does not already exist. By default, touch will create the file if not already exists.
Example:
Create an empty file
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## Create a new empty file touch myfile |
List all available files and directories
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## list all available files ls -last ## a new file named myfile has been created |
touch -c option
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## touch -c option touch -c mynewfile ## do not create the file if not exist |
List all available files and directories
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## list all available files ls -last ## mynewfile was not created due to -c option rm my* |