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searching a file

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# 1  
Old 01-12-2007
searching a file
Hi

At the moment I am able to add text to a file but what I need to do is make sure the same value is not duplicated.

Can anyone tell me how to search a file and prevent an update from taking place if the value to be entered already exists in the file?

Any help would be greatly appreciated!

Thanks
# 2  
Old 01-12-2007
Here is one way of doing it.

Code:
grep "needle" haystack >/dev/null 2> /dev/null
if [[ $? -eq 1 ]] ; then
  echo "No needle found in the haystack"
elif [[ $? -eq 2 ]] ; then
  echo "Something wrong with the haystack"
elif [[ $? -eq 0 ]] 
  echo "Found needle in the haystack"
fi ;

# 3  
Old 01-12-2007
checkout this

$1 should be your input word
tmp.txt is the file where you want to append.

#! /usr/bin/bash

b=$1
grep "$1" tmp.txt
if [ $? = 0 ]; then
echo "already exists"
else
echo "$b" >> tmp.txt
fi
Last edited by Krrishv; 01-12-2007 at 09:19 AM..
# 4  
Old 01-12-2007
Thank you for the replies guys, I'll see if I can get it work
# 5  
Old 01-12-2007
Code:
grep -q "^${value}\$" file 2>/dev/null || echo "${value}" >> file


Jean-Pierre.
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