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Script calls command that requires input

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# 1  
Old 08-15-2008
Script calls command that requires input
Greetings,

Newbie here on the site. I have searched for a similar issue but am not finding one.
I have a script that invokes a command if text is found in a file.
The command asks for a y/n response, but is not an option on the command, i.e. `command -y`.
I am familiar with the <<EOF, but I am stuck at getting this response read to automate the task.
Please help.
Thanks

Code:
 
#!/bin/ksh
PATH=mypath
SERV=`uname -n`
OUT=/path/to/.$SERV.out
 
grep '^text'  /my/file
RC=`echo $?`
if [ $RC = 0 ] ; then
  command -filename=$OUT << here is where I need a yes response
  else echo "my text" > $OUT
fi

# 2  
Old 08-15-2008
try doing
Code:
echo yes | command -filename=$OUT

or
Code:
 echo -n yes | command -filename=$OUT

# 3  
Old 08-16-2008
That did the trick.
Code:
echo yes | command -filename=$OUT

Misleading on the command line, as the command sits there like it is waiting for a response and the echo does not write to stdout.
The command completes and my file has the expected results.
Thanks!
# 4  
Old 08-16-2008
As an aside, RC=`echo $?` is a prime example of Useless Use of Echo. You want simply RC=$? (Useless Use of Test notwithstanding).

This is just a comment on style and succinctness. If you don't really care, just ignore it. Otherwise, Google for "useless use of" for more on the topic.

Code:
#!/bin/ksh
PATH=mypath
SERV=`uname -n`
OUT=/path/to/.$SERV.out
 
if grep '^text' /my/file >/dev/null
then
  echo yes | command -filename=$OUT
else 
  echo "my text" > $OUT
fi

# 5  
Old 08-18-2008
Thanks era. I am a firm believer in "short and sweet".
# 6  
Old 08-18-2008
Just to reinvolve the EOF thing:
Code:
command -filename=$OUT <<EOF
yes
EOF

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