如何在Powershell中的文件的每一行上打印/附加行索引号

Question

sapmple.txt as below

row1col1||col2||col2||col3
row2col1||col2||col2||col3
row3col1||col2||col2||col3

expected

0||row1col1||col2||col2||col3
1||row2col1||col2||col2||col3
2||row3col1||col2||col2||col3

I coded like

get-content "C:\sample.txt" | foreach { "[|][|]" + $_ } | foreach { Index  + $_ } | set-content "C:\sample1.txt"

calling the pipe and then respective index, but not working.

Can you please help.

Answer 1

just like this:

$index = 0
Get-Content 'C:\sample.txt' | ForEach-Object { "{0}||{1}" -f $index++, $_ } | Set-Content 'C:\sample1.txt'

If want to prepend leading zeroes to your index so also larger numbers will align (in this example all indices will have 4 digits):

Get-Content 'C:\sample.txt' | ForEach-Object { "{0}||{1}" -f ($index++).ToString("0000") , $_ } | Set-Content 'C:\sample1.txt'

Answer 2

What is index in your example? Strings do not have an index property nor does Get-Content create one as far as I know.

Get-Content already knows line numbers using ReadCount so keeping a running index is redundant. It does however start counting at one so a small adjustment would need to be made there to match your desire.

Get-Content C:\temp\text.txt | ForEach-Object {"{0}||{1}" -f ($_.ReadCount - 1),$_}

We use the format operator -f to try and make for easier to edit output string. Simply pipe the output of the foreach-object to its desired output.

Answer 3

另一个想法：

% { $i = 0 } { "$i||$_" ; $i++ }