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String comparsion compare *

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# 1  
Old 11-26-2012
String comparsion compare *
Dear all

Would anyone tell me how to prevent user from input non asterisk(i.e. *) character via keyboard?
Code:
#!/bin/ksh
targetHour=-1
while [[ ($targetHour != "*") && (($targetHour -lt 0)||($targetHour -gt 23)) ]]
do
  echo "Please input target hour":
  read targetHour
done

When I execute the above coding, and then input a "j", it return the following message:

The specified number is not valid for this command.

Thank you very much
Last edited by cstsang; 11-27-2012 at 12:01 AM..
# 2  
Old 11-27-2012
try adding a line after read line:
Code:
echo "$targetHour" | grep -q "^[0-9]+$" || { echo "Invalid entry." ; targetHour=-1 ; }

# 3  
Old 11-27-2012
My requirement is only accept user input 0 ~ 23 and * ( not wildcard, asterisk only ).
Would you tell me how to change the code for archiving my goal?
Last edited by cstsang; 11-27-2012 at 01:59 AM..
# 4  
Old 11-27-2012
Quote:
Originally Posted by cstsang
My requirement is only accept user input 0 ~ 23 and * ( not wildcard, asterisk only ).
Would you tell me how to change the code for archiving my goal?
Try

Code:
targetHour=-1
while [[ $targetHour != "*"  && ( $targetHour -lt 0 || $targetHour -gt 23 || $(echo $targetHour | grep "[a-zA-Z]" -c) != 0 ) ]]
do
  echo "Please input target hour"
  read targetHour
done

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