Shell Programming and Scripting

Hey,

I'm working on a file traversal and extraction function and am having problems.

So, my script is finding all files in a directory. Each file has the same format. I need to extract a field from the 4th line of each file..... hence why I am using the substring on NR == 4. So, I am extracting some names and I need to print out a list of unique names..... so, I was thinking of storing the names in an array list called Names. Then, at the end of my for loop, I want to invoke another awk script to print back the names in sorted order. But, everything I have tried hasn't worked. I'm not sure if there is a scope issue.... (by redeclaring another awk block, I can't read from the variables in the 1st block).

Am I approaching this script incorrectly? As you can tell, I'm new to AWK, and am having difficulties.

Code:

ARCHIVE=/home/directory
 
        for file in `find $ARCHIVE -type f`
            do
                awk 'BEGIN { RS = "\n" } ;
                {
                        if (NR == 4)
                        {
                           Names[substr($0,14)] = substr($0,14)
                        }
                }' $file
            done

Maybe this:

Code:

ARCHIVE=/home/directory
 
for file in `find $ARCHIVE -type f` | \
        awk 'BEGIN { RS = "\n" } ;
        {
                if (NR == 4)
                {
                   Names[substr($0,14)]++
                   exit
                }
        }
        END {for (i in Names) {print i} }' | sort -u

Unfortunately there's no 'nextfile' in most popular awk implementations - I believe gawk has it though.

Code:

#!/bin/ksh

ARCHIVE=/home/directory
 
awk '
  FNR==4 { 
     Names[substr($0,14)]
  }
  END {
      for( i in Names)
          print i
  }
' $(find $ARCHIVE -type f) | sort

Hi,

I can't get either of these to work still. And I need to use bash not ksh... (Not exactly sure what the difference is)

Jim,
you're not iterating through $file - 'awk' will wait for its input.
there's no 'do/done' for the 'for' loop

Edited the original post - missing iterator in the 'END' block - sorry 'bout that.

bash/ksh - should not matter for that script.

Hi...

Thanks for clarifying... however , i get an error:

./scr: line 11: syntax error near unexpected token `|'
./scr: line 11: `for file in `find $ARCHIVE -type f` | \'