[regex]::Split help

I have this file:

PS C:\> gc test1.csv
marco,111
shaw,222

I *only* want to ouput the 1st part of each line. In other words, I just
want this to show in the output:

marco
shaw

Tried this, but it doesn't quite work:
PS C:\> gc test1.csv|foreach {[regex]::Split(($_),"`,")}
marco
111
shaw
222
PS C:\>

"Marco Shaw" wrote:

> I have this file:
>
> PS C:\> gc test1.csv
> marco,111
> shaw,222
>
> I *only* want to ouput the 1st part of each line. In other words, I just
> want this to show in the output:
>
> marco
> shaw

This is another example which shows that you often don't need regex for
simple tasks:

PS> gc test1.csv | foreach { $_.split(',')[0] }
marco
shaw

Also note that if your csv file had a header, you could simply use
import-csv cmdlet:

PS> gc test1.csv
name,value
marco,111
shaw,222

PS> import-csv test1.csv

name
value
----
-----
marco 111
shaw 222

PS> import-csv test1.csv | % {$_.name}
marco
shaw

--
greetings
dreeschkind

I truly wish import-csv could handle csv files without headers. Maybe
it could come up with default field names or something...

>
> Also note that if your csv file had a header, you could simply use
> import-csv cmdlet:
>
> PS> gc test1.csv
> name,value
> marco,111
> shaw,222
>
> PS> import-csv test1.csv
>
> name
> value
> ----
> -----
> marco 111
> shaw 222
>
> PS> import-csv test1.csv | % {$_.name}
> marco
> shaw
>
> --
> greetings
> dreeschkind

> I truly wish import-csv could handle
> csv files without headers. Maybe
> it could come up with default field
> names or something...
>

Perhaps use Microsoft's Log Parser
(for sure if the files are large):

An TSV demo:

PS> netstat -ano

Active Connections

Proto Local Address Foreign Address State
PID
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
848
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
4
(...)

See the headers shown above?

PS> netstat -ano |
>> LogParser "SELECT * FROM STDIN" -i:TSV `
>> -iSeparator:space -nSep:2 -fixedSepff `
>> -nSkipLines:3
>>
Filename RowNumber Proto Local Address Foreign Address State
PID
-------- --------- ----- ----------------- --------------- --------- ------
STDIN 5 TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
848
STDIN 6 TCP 0.0.0.0:445 0.0.0.0:0 LISTENING 4
(...)

Now to get rid of Log Parsers headers
shown above just add -headersff

PS> netstat -ano |
>> LogParser "SELECT * FROM STDIN" -i:TSV `
>> -iSeparator:space -nSep:2 -fixedSepff `
>> -nSkipLines:3 -headersff
>>
STDIN 5 TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 848
STDIN 6 TCP 0.0.0.0:445 0.0.0.0:0 LISTENING 4

Now get the fields you _only_ want:

PS> netstat -ano |
>> LogParser "SELECT Proto, State, Pid `
>> From STDIN" -i:TSV -iSeparator:space `
>> -nSep:2 -fixedSepff -nSkipLines:3 `
>> -headersff
>>
TCP LISTENING 848
TCP LISTENING 4
(...)

A CSV file:

PS> get-content testnames.csv |
>> LogParser "SELECT * `
>> From STDIN" -i:CSV -headersff
>>
STDIN 2 Bob Smith 123 Main Any The State 23456
STDIN 3 Mary Jones 333 Maple None What State 66545
STDIN 4 Gerry Who 345 Dead End Road Big City Small State 22434

PS> get-content testnames.csv |
>> LogParser "SELECT City,State `
>> From STDIN" -i:CSV -headersff
>>
Any The State
None What State
Big City Small State

Statistics:
-----------
Elements processed: 3
Elements output: 3
Execution time: 0.00 seconds

Try other Log Parser options too!

On 10 Nov 2006 09:41:51 -0800, mgrogan@gia.edu wrote:

>I truly wish import-csv could handle csv files without headers. Maybe
>it could come up with default field names or something...

Hi,

This function should do what you need, with a little adaptation
perhaps.

I have put comments in it so it should be fairly easy to see what it's
doing.

function global:MyimportCSV{
param($NoHeaderFile)

# Finds the number of columns in the file with no headers
$line = get-content $NoHeaderFile -totalCount 1
$array = $line.Split(',')

# Constructs a header line of the right length
$HeaderLine = ""
for($i = 0; $i -lt ($array.length)-1; $i++){
$HeaderLine += "Header($i),"
}
$HeaderLine += "Last Header"

# Gets the content of the file with no headers
$array = get-content $NoHeaderFile

# Outputs the header line to Temp.csv
set-content Temp.csv $HeaderLine

# Adds the content of the file with no headers to Temp.csv
foreach ($element in $array){
add-content Temp.csv $element
}

# Imports CSV as if the file with no headers had headers.
import-csv Temp.csv

}

I am sure that there are other ways of approaching this but the
preceding code does work for me.

Andrew Watt MVP

If you use Parse-TextObject, this becomes swimmingly easy:

gc test.csv | parse-textobject -delimiter ',' | select Property1

http://www.leeholmes.com/blog/parset...Vengeance.aspx


--
Lee Holmes [MSFT]
Windows PowerShell Development
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.

"Andrew Watt [MVP]" <SVGDeveloper@aol.com> wrote in message
news:0msbl2pe6fujkkv4ams3bv9herfepqbhm1@4ax.com...
> On 10 Nov 2006 09:41:51 -0800, mgrogan@gia.edu wrote:
>
>>I truly wish import-csv could handle csv files without headers. Maybe
>>it could come up with default field names or something...
>
> Hi,
>
> This function should do what you need, with a little adaptation
> perhaps.
>
> I have put comments in it so it should be fairly easy to see what it's
> doing.
>
> function global:MyimportCSV{
> param($NoHeaderFile)
>
> # Finds the number of columns in the file with no headers
> $line = get-content $NoHeaderFile -totalCount 1
> $array = $line.Split(',')
>
> # Constructs a header line of the right length
> $HeaderLine = ""
> for($i = 0; $i -lt ($array.length)-1; $i++){
> $HeaderLine += "Header($i),"
> }
> $HeaderLine += "Last Header"
>
> # Gets the content of the file with no headers
> $array = get-content $NoHeaderFile
>
> # Outputs the header line to Temp.csv
> set-content Temp.csv $HeaderLine
>
> # Adds the content of the file with no headers to Temp.csv
> foreach ($element in $array){
> add-content Temp.csv $element
> }
>
> # Imports CSV as if the file with no headers had headers.
> import-csv Temp.csv
>
> }
>
> I am sure that there are other ways of approaching this but the
> preceding code does work for me.
>
> Andrew Watt MVP