Shell Programming and Scripting

Please forgive my ignorance on scripting. I am trying to determine (via a script) if a certain string of characters is present . The string that I am looking for is a constant length.

Here is the string I am searching for:

Code:

Model_Type={t}, ModelName={m}

I need to determine if the above string comes after this string at the beginning of the file:

Code:

{d "%w- %d %m-, %Y - %T"}

So, in summary, I need to check 1000's of files for this exact match:

Code:

{d "%w- %d %m-, %Y - %T"} Model_Type={t}, ModelName={m}

And then once I find a file that does NOT match the above I need to ADD the Model_Type line after the timestamp.

I'm wondering if there is also a way to keep a log as to what files where changed with a datestamp of when the script ran looking for the Model_Type string.

could you please post some records of your file.
Is Model_Type value needs to be passed as parameter ?

try:
This gives you a list of files to work on:

Code:

cd /path/to/many/files
for fname in *
do 
  grep -qF  '{d "%w- %d %m-, %Y - %T"} Model_Type={t}, ModelName={m}' $fname
  if [ $? -ne 0 ] ; then
     echo $fname
  fi
done > /tmp/files.lis

For the next step we need sample input and expected output. We can apply the data in files.lis to do the work.