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Old 10-06-2007, 09:50 PM   #1
tlaresearch
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Registered: Jul 2003
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Here-document problems


I am trying to automate starting a program that has a command line interface with a here document. I want the here document to initialize the program with commands, then let it run. The problem is that after the last command is given to the program, it acts like it's still getting commands from somewhere. The program echos commands that it receives, and it's saying that it is a null character, or a string of length zero. I tried redirecting the input from a file and I get the same results. Any ideas?

#!/bin/bash

echo "starting program"

./program <<%%
o
1
l
%%

echo "done."
exit 0
 
Old 10-06-2007, 10:02 PM   #2
jschiwal
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Registered: Aug 2001
Location: Fargo, ND
Distribution: SuSE AMD64
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You need a terminator for your here document:

cat >file <<file2 EOF
line 1
line 2 - $1
EOF
 
Old 10-06-2007, 10:21 PM   #3
tlaresearch
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Registered: Jul 2003
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I don't follow your example - it's quite a different format than the shell script I posted. I thought the here document starts with the tag (%% in my case) and ends with the same tag. Do I need a terminator in addition to what I have?

Thanks for your help.
 
Old 10-06-2007, 10:44 PM   #4
makyo
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Registered: Aug 2006
Location: Saint Paul, MN, USA
Distribution: {Free,Open}BSD, CentOS, Debian, Fedora, Solaris, SuSE
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Hi.

I think your shell syntax is OK:
Code:
#!/bin/sh -

# @(#) s1       Demonstrate here documents, non-alphanumeric tokens.

cat <<%%
one
two
three
|
%%

exit 0
Producing:
Code:
% ./s1
one
two
three
|
which suggests to me that the problem lies in your program ... cheers, makyo
 
Old 10-07-2007, 10:37 AM   #5
Tischbein
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Registered: Oct 2006
Distribution: debian
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To make doubly certain you could use a non-here document to confirm:

# To print out arguments one per line:
> printf '%s\n' 0 1 0 1 '|'
0
1
0
1
|
> printf '%s\n' 0 1 0 1 '|' | ./yourprog


Lykke til!
 
  


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