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Top Forums Shell Programming and Scripting Initialize file name bash shell - Linux Post 303026662 by Don Cragun on Saturday 1st of December 2018 09:01:27 AM
Old 12-01-2018
Quote:
Originally Posted by bakunin
Just a small detail:



Code:
read username?'Please enter your name:'

Will display the prompt and take the input just as well.

bakunin
Hi bakunin,
It will with a recent ksh (such as version 93u+). It might with a recent bash, but not with bash version 3.26 (the version included with the latest macOS release) where the following command:
Code:
read x?'Prompt: '

prints no prompt, blocks waiting to read a response, and after a response has been entered gives the diagnostic:
Code:
bash: read: `x?Prompt: ': not a valid identifier

Other shells might do what you want, might print a diagnostic without waiting for input, or might behave in a manner similar to that shown above.

I tend to use an echo or printf to print the prompt before the read, so I get the desired results with any version of any shell that is based on Bourne shell syntax (since the mid 1970's when using echo or since the late 1980's when using printf). But, if you know you only want to run your script on a system where the shell you're using has a built-in read utility with prompting, by all means take advantage of the shortcut.
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