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Removing Lines if value exist in first file


 
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# 1  
Removing Lines if value exist in first file

I tried a few ways to resolve this using a bash script w/ a loop, no luck.

File1: roughly 6,000 account numbers such as:
1111
1512
1113
123

I also have a dozen or so csv files, w/ the account number in the 4th field. What I would like to do is remove all lines if the account number is contained in File1.

So file looking like this:
1,55,John,2000,abc
1,55,Jane,1113,abc
1,55,Smit,9565,def
1,55,Phil,123,adf
1,55,John,205480,sdf

Would end up looking like this:
1,55,John,2000,abc
1,55,Smit,9565,def
1,55,John,205480,sdf

Any help would be appreciated!
# 2  
cat filter.sh

Code:
#/usr/bin/bash

INFILE=${1}

IFS=","

cat ${INFILE} | \
while read A B C ID D
do
  grep "^${ID}" excludes > /dev/null
  if [ ${?} -ne 0 ]
  then
    echo "${A},${B},${C},${ID},${D}"
  fi
done

cat filter2.sh

Code:
#/usr/bin/bash

INFILE=${1}

cat ${INFILE} | \
while read LINE
do
  ID=`echo "${LINE}" | cut -f4 -d","`

  grep "^${ID}" excludes > /dev/null
  if [ ${?} -ne 0 ]
  then
    echo "${LINE}"
  fi
done

cat excludes
Code:
1111
1512
1113
123

cat infile
Code:
1,55,John,2000,abc
1,55,Jane,1113,abc
1,55,Smit,9565,def
1,55,Phil,123,adf
1,55,John,205480,sdf

Execute:

filter1.sh infile
or
filter2.sh infile

or

filter1.sh infile > outfile
or
filter2.sh infile > outfile
# 3  
Works great - I used your 2nd suggestion. Processed huge files a lot faster that I would have thought.

You really helped me out of a jam! Thanks again.
# 4  
Wow...

No way would I use a shell for that job! The following Perl script is probably a hundred times faster and more efficient!

Put the following into a file and add execute permission. Run the script and give it two filenames. The first should be the list of account numbers to exclude and the second should be the list that has the account number in field 4.

Code:
#!/usr/bin/perl

my @a, %exclude;
my $file = shift;
open(EXCLUDE_LIST, "< $file") or die;
chomp( @a=<EXCLUDE_LIST> );
close(EXCLUDE_LIST);
@exclude{@a}=@a;

while (<>) {
    print unless exists $exclude{ (split(/,/))[3] };
}

# 5  
Tried the Perl version - yeah, does work a LOT faster. Not familiar w/ Perl - had one question - if the account number changes position, i know i can edit the [3] to let's say [0] if it is located in the first column.

My question is how can i make that account number position a variable so that i can pass it at the same time I'm specifying the file names? Unfortunately, some of the files I am scrubbing against, the variable changes position.

Thanks again!
# 6  
awk alternative:

Code:
awk -F',' 'NR==FNR{_[$0]=1}NR>FNR&&!_[$4]{print}' exclude infile

# 7  
For the awk option - how do i put it into a bash script? When running manually, works great. As soon as I put that same line into a script, the $0 and $1 doesn't utilize the arguments specified in that line of code.

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