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Awk/Sed: Search Pattern from file and Print

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# 1  
Old 01-27-2011
Awk/Sed: Search Pattern from file and Print
Hi,

I want to search for patterns (from a file) in a file and print the line matching the patterns and the line before it.

I have to search for 100s of patterns from a file.

Any help with AWK or Sed.

Thanks!
# 2  
Old 01-27-2011
You can use grep with option -f and -B

Code:
grep -B 1 -f pattern_file search_file

This User Gave Thanks to pravin27 For This Post:
saint2006
# 3  
Old 01-27-2011
Make the patterns file into a sed or awk script. In sed, to have the line before is a bit inconvenient, a looping sed:
Code:
sed -n '
  :loop
  $q
  N
  /\nPATTERN_1/b p
  /\nPATTERN_2/b p
  . . .
  :x
  s/.*\n//
  b loop
  :p
  p
  b x
 ' data_file

grep does it so simply, one wonders why awk and sed? ex might be good for this, too.
This User Gave Thanks to DGPickett For This Post:
saint2006
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