====== BASH - Files - Search files for specific text ======

===== Simple Search =====

Print all lines containing the keyword test:
    
<code bash>
grep test file.txt
</code>

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===== Search with many keywords =====

Create a file that has all the keywords, one per line and run:
 
<code bash>
grep -f keywords.txt file.txt
</code>

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===== Search using read =====

Process a file line by line, exit if the line is found:

<code bash>
while read line; do 
  echo $line | grep test && break; 
done < file.txt
</code> 

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===== Read and Testing return status =====

<code bash>
while read line; do let c++; echo $line | grep test >/dev/null; 
  if [[ $? == 0 ]] ; then echo Match for line $c : $line;
  else echo No match for line $c; fi  
done < file.txt
</code>