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How to get a prompt from a shell script?

Posted on 2011-09-21
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Last Modified: 2012-05-12
Hi,
Let's say I have very basic tcsh file.

and it has something like

echo This is for file X

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Now every time I run this file, I want it to ask me X then print it as the following:

>> ./example.csh
>> Which file: 
>> MyFile
>> This is for file MyFile

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How can I do that?

Thanks,





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Question by:Tolgar
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5 Comments
 
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Expert Comment

by:sakman
ID: 36574318
Here's one way, without any error checking:

#!/usr/bin/tcsh 

echo -n "Which file? "
set file_name = $<
echo "This is for file $file_name"

exit 0

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The "echo -n" sends the prompt without a newline and the "$<" reads from standard input.
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Author Comment

by:Tolgar
ID: 36580485
Hi,
Thank you for your reply.

What kind of error checking can be added to this code?

Thanks,
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LVL 4

Accepted Solution

by:
sakman earned 500 total points
ID: 36580918
Anytime you accept user input, what was entered should be tested.

Two tests you can do are 1) was a file name entered and, 2) does the file name entered exist.

Checking if the file name exists is optional if you don't care that the file exists or not...

#!/usr/bin/tcsh 

# Set file_name to blank.
#
set file_name 

# Get user input.  Continue if a blank was entered.
#
while ($file_name == "")

	echo -n "Which file? "
	set file_name = $<

end

# Does the file exist?
#
if (-f $file_name) then
	# Yes.  
	#
	echo "This is for file $file_name"
else
	# No. 
	#
	echo "Cannot find file: $file_name"
endif

exit 0

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LVL 4

Assisted Solution

by:sakman
sakman earned 500 total points
ID: 36580943
Actually, the exit code should depend on whether the file was found or not.  So "exit 1" if not found and "exit 0" if found...

# Does the file exist?
#
if (-f $file_name) then
	# Yes.  
	#
	echo "This is for file $file_name"
	exit 0
else
	# No. 
	#
	echo "Cannot find file: $file_name"
	exit 1
endif

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0
 

Author Closing Comment

by:Tolgar
ID: 36644136
Thanks for prompt reply.
0

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