04-15-2014
Csv file parsing and validating
Hi,
I have basic knowledge on unix shell scripting(not an expert).
My requirement is reading the csv file using the schema defined in the configuration file and if the condition is not mached then move the unmatched record to a error file and matched good records into other file.
In brief:
Here i'm defining the schema of an input file in normal text file and I'm calling it as configuration file. My configuration file looks like :
col1 integer NN
col2 string
col3 string NN
Also I'm having a data file ( say its a .csv file) and it looks like :
id,name,location
1,John,FL
2,Merry,,
3,Taylor,CA
a,George,MI
So here i need to write unix sript such a way that while reading the csv data file ,it should refer to the configuration file for the datatype and whether that field is NULL or not. If it is not satisfying the condition it should drop that whole record and move for the next row for the validation check.
Here it has to read the 1st row value from the csv file and check the datatype of that value from the configuration file. If the value type of the 1st row is matched with the datatype of the 1st column , then it has to move the matched record into a new file and if unmatched record is found it has to move those error records into an error file.
How this can be done using UNIX shell scripting.
Here my expected result is :
id,name,age
1,John,FL
3,Taylor,CA
Rest of the records are dropped because :
2,Merry,, ---> here 3rd filed is NULL but in configuration file it is NOT NULL(NN)
a,George,MI --> here 1st field value is STRING where in conf file it is INTEGER.
So how this could be achieved in unix script and what are the commands need to be used to do this.
Please let me know if the scenario is not clear.
Thanks,
Shree11
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a CSV file which contains number series as one of the fields. Some of the records of the field look like :
079661/3
I have to convert the above series as
079661
079662
079663
and store it as 3 different records.
Looking for help on how to achieve this. Am a newbie at Shell... (10 Replies)
Discussion started by: mihirk
10 Replies
2. Shell Programming and Scripting
I am trying to parse a csv file in the below 'name-value pair' format and then use the values corresponding to the name.
Type:G,Instance:instance1,FunctionalID:funcid,Env:dev,AppName:appname... (6 Replies)
Discussion started by: chiru_h
6 Replies
3. Shell Programming and Scripting
I have a CSV file that needs to through two seperate processes (in the end there will be 2 files (Dload.unl and Tload.unl and we'll say the input file name is mass.csv). I have a processfile() function that will call the process Dload funtion. In Dload I want to read mass.csv into Dload and then... (1 Reply)
Discussion started by: dolo21taf
1 Replies
4. Shell Programming and Scripting
I have been trying to find a good solution for this seemingly simple task for 2 days, and I'm giving up and posting a thread. I hope someone can help me out!
I'm on HPUX, using sqlplus, mailx, awk, have some other tools available, but can't install stuff that isn't already in place (without a... (6 Replies)
Discussion started by: soldstatic
6 Replies
5. Shell Programming and Scripting
Hey guys,
I'm in the process of learning PHP and BASH scripting. I'm getting there, slowly ;)
I would like some help with parsing a CSV file. This file contains a list of hostnames, dates, and either Valid, Expired, or Expired Soon in the last column.
Basically, I want to parse the file,... (12 Replies)
Discussion started by: dzl
12 Replies
6. Shell Programming and Scripting
Yes, there is a great doc out there that discusses parsing csv files with sed, and this topic has been covered before but not enough to answer my question (unix.com forums).
I'm trying to parse a CSV file that has optional quotes like the following:
"Apple","Apples, are fun",3.60,4.4,"I... (3 Replies)
Discussion started by: analog999
3 Replies
7. Shell Programming and Scripting
Hello list,
I am working on a csv file which contains two fields per record which contain IP addresses. What I am trying to do is find records which have identical fields(IP addresses) which occur 4(four) times, and if they do, delete all records with that specific identical field(ip address).
... (4 Replies)
Discussion started by: landossa
4 Replies
8. Shell Programming and Scripting
Hi Members, I am stuck with the following problem. Request your kind help
I have an csv file which contains, 1 header record, data records and 1 footer record. Sample is as below
Contents of cm_update_file_101010.csv
--------------------------------------------------
... (6 Replies)
Discussion started by: ramakanth_burra
6 Replies
9. Shell Programming and Scripting
Hi,
Newbie here and I need some help to parse a csv file that contains fields separated by ",". What I need to achieve here is, read the 1 line file and extract 240 fields and pass to a variable and then read the next 240 fields and pass to a variable, over and over. If anyone can assist that... (4 Replies)
Discussion started by: tmslixx
4 Replies
10. Shell Programming and Scripting
Hello All,
I have an input CSV file like below, where first row data can be in different position after every run of the tool, i.e. pzTest in below example is in column 1, but it can be also in 3 column and same for all the headers in the first row.
pzTest, pzExtract, pxUpdate, pzInfo... (1 Reply)
Discussion started by: asirohi
1 Replies
csv(n) CSV processing csv(n)
NAME
csv - Procedures to handle CSV data.
SYNOPSIS
package require Tcl 8.3
package require csv ?0.3?
::csv::join values {sepChar ,}
::csv::joinlist values {sepChar ,}
::csv::read2matrix chan m {sepChar ,} {expand none}
::csv::read2queue chan q {sepChar ,}
::csv::report cmd matrix ?chan?
::csv::split line {sepChar ,}
::csv::split2matrix m line {sepChar ,} {expand none}
::csv::split2queue q line {sepChar ,}
::csv::writematrix m chan {sepChar ,}
::csv::writequeue q chan {sepChar ,}
DESCRIPTION
The csv package provides commands to manipulate information in CSV FORMAT (CSV = Comma Separated Values).
COMMANDS
The following commands are available:
::csv::join values {sepChar ,}
Takes a list of values and returns a string in CSV format containing these values. The separator character can be defined by the
caller, but this is optional. The default is ",".
::csv::joinlist values {sepChar ,}
Takes a list of lists of values and returns a string in CSV format containing these values. The separator character can be defined
by the caller, but this is optional. The default is ",". Each element of the outer list is considered a record, these are separated
by newlines in the result. The elements of each record are formatted as usual (via ::csv::join).
::csv::read2matrix chan m {sepChar ,} {expand none}
A wrapper around ::csv::split2matrix (see below) reading CSV-formatted lines from the specified channel (until EOF) and adding them
to the given matrix. For an explanation of the expand argument see ::csv::split2matrix.
::csv::read2queue chan q {sepChar ,}
A wrapper around ::csv::split2queue (see below) reading CSV-formatted lines from the specified channel (until EOF) and adding them
to the given queue.
::csv::report cmd matrix ?chan?
A report command which can be used by the matrix methods format 2string and format 2chan. For the latter this command delegates the
work to ::csv::writematrix. cmd is expected to be either printmatrix or printmatrix2channel. The channel argument, chan, has to be
present for the latter and must not be present for the first.
::csv::split line {sepChar ,}
converts a line in CSV format into a list of the values contained in the line. The character used to separate the values from each
other can be defined by the caller, via sepChar, but this is optional. The default is ",".
::csv::split2matrix m line {sepChar ,} {expand none}
The same as ::csv::split, but appends the resulting list as a new row to the matrix m, using the method add row. The expansion mode
specified via expand determines how the command handles a matrix with less columns than contained in line. The allowed modes are:
none This is the default mode. In this mode it is the responsibility of the caller to ensure that the matrix has enough columns to
contain the full line. If there are not enough columns the list of values is silently truncated at the end to fit.
empty In this mode the command expands an empty matrix to hold all columns of the specified line, but goes no further. The overall
effect is that the first of a series of lines determines the number of columns in the matrix and all following lines are
truncated to that size, as if mode none was set.
auto In this mode the command expands the matrix as needed to hold all columns contained in line. The overall effect is that after
adding a series of lines the matrix will have enough columns to hold all columns of the longest line encountered so far.
::csv::split2queue q line {sepChar ,}
The same as ::csv::split, but appending the resulting list as a single item to the queue q, using the method put.
::csv::writematrix m chan {sepChar ,}
A wrapper around ::csv::join taking all rows in the matrix m and writing them CSV formatted into the channel chan.
::csv::writequeue q chan {sepChar ,}
A wrapper around ::csv::join taking all items in the queue q (assumes that they are lists) and writing them CSV formatted into the
channel chan.
FORMAT
Each record of a csv file (comma-separated values, as exported e.g. by Excel) is a set of ASCII values separated by ",". For other lan-
guages it may be ";" however, although this is not important for this case (The functions provided here allow any separator character).
If a value contains itself the separator ",", then it (the value) is put between "".
If a value contains ", it is replaced by "".
EXAMPLE
The record
123,"123,521.2","Mary says ""Hello, I am Mary"""
is parsed as follows:
a) 123
b) 123,521.2
c) Mary says "Hello, I am Mary"
SEE ALSO
matrix, queue
KEYWORDS
csv, matrix, queue, package, tcllib
csv 0.3 csv(n)