printing using for loop in linux shell scripting

Question

I have 2 files with multiple fields. File A is dynamic which has users logged in everyday and their login times and date. File B has the total number of users and their airport codes. File B is a static file. I need to print the File A data along with the airportcodes of the users. I used the below script..

A=`cut -d " " -f1 /data/sampleupdatedreport.csv`
for A
do
grep $A /home/s399682/StarUsers.txt >tmp_today.csv
done

It is not working. Please help me to find a solution for this. Thanks very much in advance!!!

It would be helpful to show some sample data from the 2 files. — glenn jackman
– glenn jackman, Commented Nov 27, 2013 at 15:36

devnull · Accepted Answer · 2013-11-27 14:05:20Z

1

Your script can be written as:

grep -f <(cut -d " " -f1 /data/sampleupdatedreport.csv) /home/s399682/StarUsers.txt >tmp_today.csv

This would match all lines in /home/s399682/StarUsers.txt that match the output produced by the cut command.

If you really wanted to write a script, you could say:

while read -r line; do
  grep "$line" /home/s399682/StarUsers.txt
done < <(cut -d " " -f1 /data/sampleupdatedreport.csv) > tmp_today.csv

edited Nov 27, 2013 at 14:05

answered Nov 27, 2013 at 14:00

devnull

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twalberg · Accepted Answer · 2013-11-27 15:24:10Z

1

You might be looking for join...

answered Nov 27, 2013 at 15:24

twalberg

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