You can use the following syntax in PowerShell to replace the first character of each string in a file:
Get-Content old.txt | ForEach { $_ -replace "^#", "_" } | Set-Content new.txt
This particular example will replace the # character at the beginning of each string in the file named old.txt and save the results to a new file named new.txt.
Here is what the various commands do:
- Get-Content: Returns all lines from the text file
- ForEach: Specifies an action to perform on each line of the file
- $_: Returns the existing text from current line
- -replace “^#”, “_”: Replaces the starting ( ^ ) character of # with _
- Set-Content: Saves the updated content to a specific text file
The following example shows how to use this syntax in practice.
Example: How to Replace First Character in String Using PowerShell
Suppose we have a file named team_list.txt in our current directory that contains the names of various basketball teams.
We can use the Get-Content cmdlet to view the contents of this file:
Suppose that we would like to replace the # character at the start of each line with an underscore instead.
We can use the following syntax to do so:
Get-Content team_list.txt | ForEach { $_ -replace "^#", "_" } | Set-Content team_list2.txt
The following screenshot shows how to use this syntax in practice:
Notice that when we use the Get-Content cmdlet to view the contents of the new team_list2.txt file we can see that the first character in each line has been replaced with an underscore.
Note: You can find the complete documentation for the Foreach statement in PowerShell here.
Related Tutorials
The following tutorials explain how to perform other common tasks in PowerShell:
PowerShell: How to Replace Comma with Newline
PowerShell: How to Replace Specific Text in Multiple Files
PowerShell: How to Replace Only First Occurrence of Word in String
