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Old 02-01-2008, 06:52 AM   #1
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"searching for a matching pattern"


i am trying to search for a particular word form a file.
My code is not working. Please help

cat filename | while read line
for i in $line ;do
if [ "i" == "world" ]; then
echo "found"

Here i am first reading a line and then comparing each world of the line with the word "world".
Old 02-01-2008, 07:03 AM   #2
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You are missing a $ before i:

if [ "$i" == "world" ]; then

And by the way, why not use grep?
Old 02-01-2008, 07:12 AM   #3
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thanks for my code is working
Old 02-01-2008, 07:18 AM   #4
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cat filename | while read line
Does this work? A pipe is used to pass output to a command that expects input. I don't know what it means to pass data to the "while" command.

"read" means get data from standard input (the keyboard unless changed)

for i in $line; do
This only loops once (if at all). The "i in" construct has to be followed by something that produces a list of values.
Old 02-01-2008, 07:23 AM   #5
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Originally Posted by pixellany View Post
Does this work?
yes it does. The "better" way is to skin the cat totally.
while read -r line
  # blah
done < "file"
Old 02-01-2008, 09:06 AM   #6
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Why are you using this instead of grep?

Old 02-02-2008, 12:24 PM   #7
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Two people have already asked about grep, so forgive me, but I just can't help but suggest this:

grep -wq world filename && echo found


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