Replace MKS with Powershell - powershell

Question

can anybody please translate these two scripts from MKS into Powershell? i would like to remove MKS from our ETL tools and accomplish this with Powershell but do not have the chops
1)
FileSize=ls -l $1 | awk '{print $5}'
if [ $FileSize -ge 100000000 ]; then
split -b 60000000 $1 $1
fi
2)
find $1 -type f -name *.txt -mtime +30 -exec rm {} \;
thanks very much
drew

Answer 1

Avoiding using even standard aliases here (eg. can use dir or ls rather than Get-ChildItem):
1) FileSize=ls -l $1 | awk '{print $5}'
$filesize = (Get-ChildItem $name).Length
if [ $FileSize -ge 100000000 ]; then split -b 60000000 $1 $1 fi
if ($filesize -ge 100000000) { ... }
(can't recall function of split)
2) find $1 -type f -name *.txt -mtime +30 -exec rm {} \;
$t = [datetime]::Now.AddSeconds(-30)
Get-ChildItem -path . -recurse -filter *.txt |
Where-Object { $_.CreationTime -gt $t -and $_.PSIsContainer } |
Remove-Item
(Add a -whatif to the Remove-Item to list what would be deleted without deleting them.)

Answer 2

1) Get the size of the file named by $1. If the size is more than 100 megabytes, split it into parts of 60 megabytes each.
MKS
FileSize=`ls -l $1 | awk '{print $5}'`
if [ $FileSize -ge 100000000 ]; then
split -b 60000000 $1 $1
fi
PowerShell
function split( [string]$path, [int]$byteCount ) {
# Find how many splits will be made.
$file = Get-ChildItem $path
[int]$splitCount = [Math]::Ceiling( $file.Length / $byteCount )
$numberFormat = '0' * "$splitCount".Length
$nameFormat = $file.BaseName + "{0:$numberFormat}" + $file.Extension
$pathFormat = Join-Path $file.DirectoryName $nameFormat
# Read the file in $byteCount chunks, sending each chunk to a numbered split file.
Get-Content $file.FullName -Encoding Byte -ReadCount $byteCount |
Foreach-Object { $i = 1 } {
$splitPath = $pathFormat -f $i
Set-Content $splitPath $_ -Encoding Byte
++$i
}
}
$FileSize = (Get-ChildItem $name).Length
if( $FileSize -gt 100MB ) {
split -b 60MB $name
}
Notes: Only the split functionality needed by the question was implemented, and tested just on small file sizes. You may want to look into StreamReader and StreamWriter to perform more efficient buffered IO.
2) In the directory named by $1, find all regular files with a .txt extension that were modified over thirty days ago, and remove them.
MKS
find $1 -type f -name *.txt -mtime +30 -exec rm {} \;
PowerShell
$modifiedTime = (Get-Date).AddDays( -30 )
Get-ChildItem $name -Filter *.txt -Recurse |
Where-Object { $_.LastWriteTime -lt $modifiedTime } |
Remove-Item -WhatIf
Notes: Take off the -WhatIf switch to actually perform the remove operation, rather than previewing it.