Windows – How to get PowerShell to read line by line and pass it into another command

command linepowershellwindows

A lot of the questions around the internet for this specific topic are oriented into BASH for linux, I was wondering if the same thing can be achieved using just PowerShell.

On Bash, one can use:

for line in $(cat file.txt); do echo $line; done

And then bash will loop through each line of file.txt and send it to echo or whatever command you're using.

How can the same thing be achieved on Windows's powershell?

I found that PS has the "Get-Content" command that works similarly to "cat", but I couldn't continue from there.

Best Answer

Ok it turns out that it was not that difficult but I'll leave it here for the future people of the internet.

PowerShell has a defined set of Loops, one of them called ForEach
One can simply do:

ForEach ($line in Get-Content [File]) {[Command]) $line}

Where [File] is the file path you're reading from and
Where [Command] is the command you're sending each line into.

Just as an example:

ForEach ($line in Get-Content thingstoecho.txt) {echo $line}

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Linux – How to send email with attachment by postfix from command-line

Why does it have to be postfix directly? mailx -a, mutt, or mutt -a will also use the sendmail interface -- unless you configure them for SMTP.

echo "This is a test message" | mutt -s Test -a foo.zip -- $USER

echo "This is a test message" | mail -s Test -a foo.zip $USER

(Note, in bsd-mailx the option is -A instead.)

Anyway, here's a "postfix" example.

Replace $USER, content type and filename to match your environment. Example assumes you are sending the message to yourself and have a ZIP file foo.zip in the current directory.

(printf "%s\n" \
    "Subject: test" \
    "To: $USER" \
    "Content-Type: application/zip" \
    "Content-Disposition: attachment; filename=foo.zip" \
    "Content-Transfer-Encoding: base64" \
    "";
 base64 foo.zip) | sendmail "$USER"

(Creation of MIME multipart messages left as an exercise to the reader.)

Macos – How to use a pipe to edit a file with vi

you might try this:

% vi `cat file.txt`

or, to avoid the useles use of cat:

% vi `< file.txt`

you are telling vi(m) just a bunch of arbitrary things. if you want vi(m) to do something like 'hey, open that file' you have to feed it the same commands you would use in vi(m), eg. something like :e foo.txt. but thats just more complicated than doing what i proposed.

Best Answer

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Linux – How to send email with attachment by postfix from command-line

Macos – How to use a pipe to edit a file with vi

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