PowerShell two ways to compare text files _powershell

Requirements: compare two text files, output line numbers and column numbers when not equal, and start unequal characters.

Method One: Compare-object

Using the PowerShell command Compare-object is worth learning.

Copy Code code as follows:

function compare-files{
Param
$file 1,
$file 2,
[Switch] $IncludeEqual
)
$content 1 = get-content $file 1
$content 2 = get-content $file 2
$comparedLines = compare-object $content 1 $content 2-includeequal: $IncludeEqual |
Group {$_. Inputobject.readcount} | Sort Name
$comparedLines | foreach {
$curr =$_
Switch ($_. Group[0]. Sideindicator) {
"= =" {$right = $left = $curr. Group[0]. Inputobject;break}
"=>" {$right, $left = $curr. Group[0]. Inputobject, $curr. GROUP[1]. Inputobject;break}
"<=" {$right, $left = $curr. GROUP[1]. Inputobject, $curr. Group[0]. Inputobject;break}
}
[Pscustomobject] @{
line = $_. Name
left = $left
right = $right
}
}
}

Method two, using stream processing to compare

Explanation: Instead of using a built-in string equality comparison, the function diff-string is defined to return the index of the first unequal string.

Copy Code code as follows:

function Diff-txt ([Io.fileinfo] $firstFile, [Io.fileinfo] $secondFile)
{
#参数判断
if (-not $firstFile. Exists)
{
Throw "$firstFile does not exist"
}
if (-not $secondFile. Exists)
{
Throw "$secondFile does not exist"
}
$SR 1=[io. StreamReader] $firstFile. FullName
$SR 2=[io. StreamReader] $secondFile. FullName

#内部函数: Comparing Strings
#返回-1 equals, returns other indexes that represent unequal starting from $STR1
function diff-string ([String] $str 1,[string] $str 2)
{
For ($i =0 $i-lt $str 1. Length; $i + +)
{
if ($i-lt $str 2. Length)
{
if ($str 1[$i]-cne $str 2[$i]) {return $i}
}
else {return $i}
}
if ($str 2. Length-gt $i) {return $i}
Return-1
}

# Firstfile not to the end of the file
$line =1
while (-not $SR 1. Endofstream)
{
$str 1 = $sr 1. ReadLine ()

# Secondfile to the end of the file
if ($SR 2. Endofstream)
{
Write-host "=> [$line row, 1 columns]"
}

# Secondfile not to the end of the file
Else
{
$str 2 = $SR 2. ReadLine ()
$result = diff-string-str1 $str 1-str2 $str 2
if ($result-ne-1)
{
Write-host "<> [$line Row, $result column] character->"-nonewline
Write-host $str 1[$result]-foregroundcolor Red
}
}

$line + +
}
# The second file is not at the end of the file
while (-not $SR 2. Endofstream)
{
$str 2 = $SR 2. ReadLine ()
Write-host "<= [$line row, 1 columns]"
}
# Close File stream
$SR 1. Close ()
$SR 2. Close ()
}

Test Case A

Input

The first file reads:

Copy Code code as follows:

PowerShell
Chinese blog
Jb51.net

Lai Non-moss
The second file reads:

Copy Code code as follows:

PowerShell
Chinese Podcast
Jb51.net
Lai Non-moss
Mosser Lee

Output:

Test Case Two

Input

The first file reads:

Copy Code code as follows:

Yushu
Right now, Erie.
Article contrived

The second file reads:

Copy Code code as follows:

Yushulinfeng Crazy

Output:

Article Source: http://www.pstips.net/