Detect Enter Key pressed

sajjadshahid · 09-26-2012, 12:15 PM

Hi,
On linux, I am giving the option to input info, also giving default value so that he/she can just press enter if he/she likes to keep the default value.
It works well on linux, but on aix, it gives error on if line.

echo "Input Environment [Default: $environment] :"
read environmentEntered < /dev/tty
enter=0
if [ -z $environmentEntered ]; then;environment=$environment;else;environment=$environmentEntered;fi

syntax error at line xxx : `;' unexpected

Please help,
Thanks,

TB0ne · 09-26-2012, 04:01 PM

Quote:

Originally Posted by sajjadshahid

Hi,
On linux, I am giving the option to input info, also giving default value so that he/she can just press enter if he/she likes to keep the default value.
It works well on linux, but on aix, it gives error on if line.

echo "Input Environment [Default: $environment] :"
read environmentEntered < /dev/tty
enter=0
if [ -z $environmentEntered ]; then;environment=$environment;else;environment=$environmentEntered;fi

syntax error at line xxx : `;' unexpected

Related to your other thread...see the suggestions offered there regarding differences between ksh and bash.

cliffordw · 09-27-2012, 12:38 AM

Hi again,

Your line:

Code:

if [ -z $environmentEntered ]; then;environment=$environment;else;environment=$environmentEntered;fi

Should be rewritten as:

Code:

if [ -z $environmentEntered ]; then environment=$environment; else environment=$environmentEntered; fi

to work under ksh93, i.e. no semicolons after "then" or "else".

Ideally you should also put the $environmentEntered in the test in quotes, which will allow it to run under the default AIX ksh too, as follows:

Code:

if [ -z "$environmentEntered" ]; then environment=$environment; else environment=$environmentEntered; fi

This assumes some default value is already set in $environment; if not, it should also be quoted (which is better practice anyway).

Regards,

Clifford