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How to create file and file content based existing information?


 
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# 1  
Old 03-16-2017
How to create file and file content based existing information?

Hi Gurus,
I am SQL developer and new unix user.
I need to create some file and file content based on information in two files.

I have one file contains basic information below file1 and another exception file file2. the rule is if "zone' and "cd" in file1 exists in file2, then file name is FILENAME in file2, file content is CONTENT in file2. if "zone" and "cd" doesn't exist in file2, then file name is ZONE_CD.file, file content is DT_dat. below are sample files and expected result.

I want to use while loop read file1, then somehow check file2 the zone and Cd, but I don't know how to use two items check. I want to use "grep", but I need to compare two items.

any input is welcome.

thanks in advance.


file1
Code:
 
  10 ABC 20170202 
 10 AAA 20170101 
 20 BBB 20170303

file2
Code:
 
 10 ABC SPECIALFILENAME.sh SPECIAL_CONTENT

expected result:
Code:
 
  SPECIALFILENAME.sh SPECIAL_CONTENT 1
 10_AAA.file 20170101_dat 
 20_BBB.file 20170303_dat


Last edited by Torhong; 03-17-2017 at 09:14 AM..
# 2  
Old 03-17-2017
Quote:
Originally Posted by Torhong
Hi Gurus,
I am SQL developer and new unix user.
I need to create some file and file content based on information in two files.

I have one file contains basic information below file1 and another exception file file2. the rule is if "zone' and "cd" in file1 exists in file2, then file name is FILENAME in file2, file content is CONTENT in file2. if "zone" and "cd" doesn't exist in file2, then file name is ZONE_CD.file, file content is DT_dat. below are sample files and expected result.

I want to use while loop read file1, then somehow check file2 the zone and Cd, but I don't know how to use two items check. I want to use "grep", but I need to compare two items.

any input is welcome.

thanks in advance.


file1
Code:
 
 ZONE CD DT 
 10 ABC 20170202 
 10 AAA 20170101 
 20 BBB 20170303

file2
Code:
 
 ZONE CD FILENAME CONTENT 
 10 ABC SPECIALFILENAME.sh SPECIAL_CONTENT

expected result:
Code:
 
 filename filecontent 
 SPECIALFILENAME.sh SPECIAL_CONTENT 1
 0_AAA.file 20170101_dat 
 20_BBB.file 20170303_dat

What operating system are you using?

What shell are you using?

What have you tried to solve this problem on your own?

How does combining the two lines:
Code:
 ZONE CD DT 
 ZONE CD FILENAME CONTENT

produce the output:
Code:
 filename filecontent

? How does combining the two lines:
Code:
 10 ABC 20170202 
 10 ABC SPECIALFILENAME.sh SPECIAL_CONTENT

produce the output:
Code:
 SPECIALFILENAME.sh SPECIAL_CONTENT 1

? Why does converting the line:
Code:
 10 AAA 20170101

produce the output:
Code:
 0_AAA.file 20170101_dat

?

Why would you want to use a shell while loop and grep (multiple times) when the REs needed to isolate fields in a file are much more complicated that using awk to perform field splitting and record joining operations?

Is this a homework assignment? Homework and coursework questions can only be posted in the Homework & Coursework forum under special homework rules. If this is not homework, please explain the company you work for and the nature of the problem you are working on.

If you did post homework in the main forums, please review the guidelines for posting homework and repost.
# 3  
Old 03-17-2017
Hi Don,

I updated the file content. the first line is field name for reference. my os is solaris. shell is ksh.

this is not homework. the reason I want to use while loop is I am not familiar awk.

thanks.
# 4  
Old 03-17-2017
Having assumed that
- you being an sql developer as explained in post#1 NOT posting homework questions
- the original headers of both files shall be eliminated
- the 1 trailing in output line 2 and missing in line 3 is a hyphenation error
- usage of shell and grep are NOT compulsory

you might want to try
Code:
awk '
                {IX = $1 "," $2
                }
NR == FNR       {FN[IX] = $3
                 CT[IX] = $4
                 next
                }
FNR == 1        {print "filename filecontent"
                 next
                }
IX in FN        {print FN[IX], CT[IX]
                 next
                }
                {print $1 "_" $2 ".file", $3 "_dat"
                }
' file2 file1
filename filecontent
SPECIALFILENAME.sh SPECIAL_CONTENT
10_AAA.file 20170101_dat
20_BBB.file 20170303_dat

This User Gave Thanks to RudiC For This Post:
# 5  
Old 03-17-2017
thanks Guys,

the requirement changed a little, we will read from file1, and use field1 and field2 find record in file2 and get filename and file content from file2.

I tried to write with while loop, it works. just wondering if the code can be improved.
I saw all answers use awk.

I know a little bit of awk. I will check the doc to fully understand the syntax, otherwise I will have problem if I just copy and paste.

Code:
 
 #!/bin/ksh
IFS=","
 error_cnt=0
while read zone feed date
do
echo $zone, $feed, $date
        exist_flag=0
        while read zone1 feed1 fname fct
                do
                        if [ $zone == $zone1 ] && [ $feed == $feed1 ]; then
                                echo "export ${fct}=${date}" > ${fname}
                                exist_flag=1
                                break
                        fi
                done<metapull.txt
        if [ exist_flag -eq 0 ]; then
                echo $zone, $feed " doesn't exisit in meta file" >> miss_records.txt
                error_cnt=1
        fi
done<sample.txt
 if [ error_cnt -ne 0 ]; then
        echo "Some feeds missing detail information, please check file " miss_records.txt
        exit 1
fi


Last edited by Torhong; 03-17-2017 at 03:07 PM..
# 6  
Old 03-17-2017
With just glance at your script I see that
- both input files being read via what seems to be the same file descriptor - might work by accident but is sloppy programming; use different fd explicitly
- if it would work, for every line in file1 the entire file2 is being read - highly inefficient
- every time fname is found in the input files, its hitherto existing contents will be overwritten - mayhap undesired

Last edited by RudiC; 03-17-2017 at 02:50 PM..
# 7  
Old 03-17-2017
Quote:
Originally Posted by RudiC
With just glance at your script I see that
- both input files being read via what seems to be the same file descriptor - might work by accident but is sloppy programming; use different fd explicitly
- if it would work, for every line in file1 the entire file2 is being read - highly inefficient
- every time fname is found in the input files, its hitherto existing contents will be overwritten - mayhap undesired
Thanks RudiC.

you are right, the second loop is very inefficient. is there any way to fix it without using awk as I am not familiar with awk.

thanks

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