Bash Read Comma Separated CVS File

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How do I read comma separated CVS file under UNIX / Linux / BSD / Mac OS X bash script? My sample file is as follows:

FirstName LastName,DOB,SSN,Telephone,Status


You can use while shell loop to read comma-separated cvs file. IFS variable will set cvs separated to , (comma). read command will read each line and store data into each field.

#!/bin/bash
INPUT=data.cvs
OLDIFS=$IFS
IFS=,
[ ! -f $INPUT ] && { echo "$INPUT file not found"; exit 99; }
while read flname dob ssn tel status
do
	echo "Name : $flname"
	echo "DOB : $dob"
	echo "SSN : $ssn"
	echo "Telephone : $tel"
	echo "Status : $status"
done < $INPUT
IFS=$OLDIFS

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

14 comment

  1. script that worked for me

    #!/bin/bash
    INPUT=./Zabbix_template_item.csv
    OLDIFS=$IFS
    IFS=";"
    [ ! -f $INPUT ] &while read Host Group itItemType itKey itValueType itDescription itDelay itHistory itTrends itDataType itUnits itMultiplier itDelta itFormula itParams itSnmpCom itSnmpOid itApplication
    do
            echo "Host : $Host"
            echo "Group : $Group"
            echo "itItemType : $itItemType"
            echo "itKey : $itKey"
            echo "itValueType : $itValueType"
            echo "itDescription : $itDescription"
            echo "itDelay : $itDelay"
            echo "itHistory : $itHistory"
            echo "itTrends : $itTrends"
            echo "itDataType : $itDataType"
            echo "itUnits : $itUnits"
            echo "itMultiplier : $itMultiplier"
            echo "itDelta : $itDelta"
            echo "itFormula : $itFormula"
            echo "itParams : $itParams"
            echo "itSnmpCom : $itSnmpCom"
            echo "itSnmpOid : $itSnmpOid"
            echo "itApplication : $itApplication"
    
    done < $INPUT
    IFS=$OLDIFS
    
          1. you can get the last line when you access the variables again outside the loop. using the example discussed in the post:

            —————————–
            while read flname dob ssn tel status
            …..
            done < $INPUT
            echo $flname # <—– this will be the last line of the CSV

  2. I have two Csv files one is for daily report purposed and another is for daily data purposed.
    masterreport.csv file format is

    CODE,1-May-12,2-May-12,3-May-12,4-May-12,5-May-12,
    205,0,0,0,0,0,
    23070,0,0,0,0,0,
    Interface error response CRBT fail,0,1,0,0,0,
    C2S exception,0,1,2,0,2,
    Interface Customer Recharge Not Allowed For Receiver,2240,2078,2050,2007,2363,

    —–Many more up to 45 Rows and 32 column are there
    and every day we have to update the corresponding date part from below mention file.

    dailyreport.csv
    C2S ERROR EXCEPTION TAKING TIME TILL VALIDATION , 624
    CHNL_ERROR_SNDR_AMT_NOTBETWEEN_MINMAX , 56
    Card Group Slab Suspended , 7096

    like how many error’s are coming on that day we have to update the main report , which are not match daily report we put the value 0 on main report.

    i didn’t found any logic how to do this , can any body help this

  3. This was exactly what I needed! I’m using it to import account data from a Zimbra server backup.

    IE account names are stored in the CSV and the script runs the import command with the $flname variable in the appropriate spots.

    I do have a question, How does it know to hit the next line and not just read the first line every time? My assumption is that is what the $IFS & $OLDIFS variables do. But I’m not sure.

  4. This method is only for regular simplest version of CSV. very often fields are in quotation marks and it contains comma. In that situation for row
    content1,”content,number2″,content3
    read c1 c2 c3 assign
    c1=’content1′
    c2='”content”
    c3=’number2″

    then this method is not as universal as it should be.

    last problem, very often last row in csv file is not ended with new line. in that situation read has some problem with fetching last row.

    summarizing. this is the simplest way for reading the simplest cvs formatting.

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