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Full Discussion: if then else structure
Top Forums UNIX for Dummies Questions & Answers if then else structure Post 45639 by jayakhanna on Saturday 27th of December 2003 05:32:57 AM
Old 12-27-2003
I am really sorry I was just checking the octal value for \n.
Okay any how the program should be like this

echo "Enter answer"
read answer

if [ "$answer" = "" ]
then
echo "You must enter a file name"
exit 1
else
cat $answer
fi


Well from your mail I think your concern is that you want to check whether the particular file exists or not, Am i right. If so then
use the below code after *read answer* in the above code
Code:
if [ ! -s $answer ]
then
     echo "The file does not exist"
     exit 1
fi

Regards
JK

added code tags for readability --oombera

Last edited by oombera; 02-19-2004 at 02:49 AM..
 

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answer(1)						      General Commands Manual							 answer(1)

NAME
answer - phone message transcription system SYNOPSIS
DESCRIPTION
The interactive program helps you to transcribe telephone (and other) messages into electronic mail. The program uses your personal alias database and the system alias database, allowing you to use aliases to address the messages. Options supports the following options: Prompt for phone-slip-type message fields. Allow addresses that are not aliases. Operation begins with the prompt. Enter a one-word alias or a two-word user name ("Words" are separated by spaces.) The user name is converted to an alias in the form where f is the first character of the first word, lastword is the second word, and all letters are shifted to lower- case. For example, is converted to the alias Without the option, the specified or converted alias must exist in the alias databases. With the option, if the processed "alias" is not in the alias databases, it is used for the address as is. The fully expanded address is displayed. With the option, you are asked for typical message slip data: Enter the appropriate data. You can put just an or nothing after the pertinent dash prompts, or you can type longer comments. Whatever you enter becomes part of the message. Lines with no added text are omitted from the message. Finally, you are prompted for a message. Enter a message, if any, ending with a blank line. The message is sent and the prompt is repeated. To end the program, enter any one of or at the prompt. EXAMPLES
User input is in normal type. With No Options This example shows a valid alias, an invalid user name, and a valid user name. In the invalid case, the converted alias is displayed in square brackets. With the -u Option If you enter the previous error is treated differently. With the -p Option If you enter the phone-slip prompts are added. The three lines with no added text are deleted from the message. FILES
User alias database data table User alias database directory table User alias database hash table User alias source text System alias database data table System alias database directory table System alias database hash table System alias source text Outbound mail message edit buffer AUTHOR
was developed by HP. SEE ALSO
elm(1), newalias(1). answer(1)
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