Solved

Need batch file to accept piped input, or widows 'cat' equivalent that can be piped-to. 'type' and 'for /f' not working.

Posted on 2013-05-16
10
695 Views
Last Modified: 2014-06-11
Hello,
     In unix shell scripts, I could use cat > /tmp/sometempfile at the beginning of a script to receive input being piped into the script, to then do something with it. I'm trying to do the same on Windows, using built in commands, so it can work on all computers in the company without installing anything.

The 'type' command requires a filename argument / doesn't seem to support being piped to, and putting  
for /F "delims=" %%a in ('more') do @echo %%a >> %temp%\sometempfile

Open in new window

 at the beginning of the batch file is adding CR characters and otherwise screwing up just the binary parts of files I'm piping through it.

Before I give up, and install cygwin on all computers, just to get the cat command, is there any way to do this with native commands in a batch file? Switching the character set to unicode, etc?
0
Comment
Question by:RalphNY
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
10 Comments
 
LVL 43

Expert Comment

by:Steve Knight
ID: 39173258
You should be able to do:

@echo off
more > x.txt

to receive output of dir | script.cmd  into x.txt

which then you can parse the x.txt as you wish.  You might also be better off using one redirect rather than line by line... but presumably more is messing with the data you are piping in.

(for /F "delims=" %%a in ('more') do @echo %%~a)> %temp%\sometempfile

you could also probably use this, not sure if any better or worse for you.

find /v "" > x.txt

Does the batch have to be piped into, could it not take a parameter, e.g.

yourbatch.cmd mybinaryfile.dat

Steve
0
 
LVL 54

Expert Comment

by:Bill Prew
ID: 39173605
Why are you piping binary data, that's typically a bad idea, piping is really meant for text data.

~bp
0
 

Author Comment

by:RalphNY
ID: 39173720
@Dragon-it,
    Thanks for the tries, but unfortunately, all of those give the same output/problems as the 'for /f' command I had- the output has CRLFs instead of just LFs and the binary/Stream portion is modified in a lot of ways, and made longer.

@billprew,
   I'm redirecting printer output through this script, using redmon, to convert (mostly PDFs, but anything sent to this printer) to single-page-per-file TIFs using ghostscript.  There are also other things I want to do, like crop the files, where I will need to solve this same inability-to-cat-piped-input-to-a-temp-file-problem.

I have the redirected printer to ghostscript working: You print something to it, you get sequentially numbered TIFs on your desktop. But - if you do it a 2nd, etc time, it starts the page numbers at 1 again and overwrite the previous pages printed.

I want to have the TIFs be named with both timestamps and page numbers, so subsquent printouts don't clobber the previous ones.

I can get the timestamp, but currently, ghostscript is the first command called in the script (see below), so I can't get the timestamp until after I need it.

If I could receive the piped in input into a temp file, I could then get the timestamp to use for the file name, then use that temp file as an argument to the 'type' command, to pipe that temp file to ghostscript, in the batch file.

C:\gs\bin\gs.exe -Ic:\gs\lib;C:\gs\fonts -sDEVICE=tiffg4 -sOutputFile="%timestampfilename%p%d.tif" -dNOPAUSE -dSAFER -dBATCH -r300 -sPAPERSIZE=letter -
0
Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

 
LVL 43

Expert Comment

by:Steve Knight
ID: 39173803
hmm, so presumably you could get the timestamp you want regardless of the redirecting issue then as that would run the same - I presume you just want it as 'now', why not:

@echo off
set timestamp=%date:/=-%@%time::=%

i.e. crude way to get the current date and time without ? or : chars.  you could also put alll pages in a subdir perhaps, i.e.
md %timestamp% and then have "%timestamp%\%p%d" or whatever as filename.

on phone so sorry if missed something there... will look back on pc later.

steve
0
 
LVL 16

Expert Comment

by:DansDadUK
ID: 39174116
I agree with billprew - most of the DOS commands were designed for text data (and in Windows systems, text line termination is usually the CarriageReturn-LineFeed pair), although the copy command allows for binary data (with the /b switch) - but (like type) requires parameters rather than accepting an input pipe.

What about investigating use of Windows PowerShell scripts instead of the old DOS batch scripts?
I don't know whether or not the numerous built-in PowerShell cmdlets will provide a solution to your requirement.
0
 
LVL 43

Expert Comment

by:Steve Knight
ID: 39174193
If you want a date in specific format BTW try one of these methods of mine.  Get that into an environment variable and use it in your commandline for gs.exe

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/MS_DOS/A_1153-Using-dates-in-batch-files-scripts.html

Another alternative might be VBScript.  You can read STDIN into a variable if wanted then do what you want with, i.e. parse or write it out into a file:
Dim STDIN
STDIN = WScript.StdIn.ReadAll
WScript.Echo STDIN

Open in new window


dir | cscript //nologo stdin.vbs
0
 
LVL 54

Expert Comment

by:Bill Prew
ID: 39184041
I'm redirecting printer output through this script, using redmon, to convert (mostly PDFs, but anything sent to this printer) to single-page-per-file TIFs using ghostscript.  There are also other things I want to do, like crop the files, where I will need to solve this same inability-to-cat-piped-input-to-a-temp-file-problem.
Rather than using STDOUT/STDIN, why not let the printer driver redirect to an actual file, and then pick up that file in the batch script?

~bp
0
 
LVL 84

Accepted Solution

by:
oBdA earned 500 total points
ID: 39225047
Since you're using RedMon anyway, let RedRun.exe (part of the package) generate a temp file and start your script; RedRun is designed exactly for what you're trying to do.
From the Readme.txt: When started, RedRun will write standard input to a temporary file, until it reaches end of file.  It will then start the specified program.  RedRun will wait until the specified program terminates, then will delete the temporary and terminate itself.
In the properties of RedMon, enter the path to RedRun.exe as program to redirect the port to, and as arguments for the program, enter the path to your script, followed by "%1", for example like this:
C:\CreateTIFF\CreateTIFF.cmd "%1"
In your script, you now can access the print file using "%1" and pass it as argument to Ghostscript.
0

Featured Post

Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
PC freezes and shutdowns becoming more frequent 17 145
Event log and black screen 22 69
Abstract Express Replacement Software 12 47
Need help with software deployments 3 74
Storage devices are generally used to save the data or sometime transfer the data from one computer system to another system. However, sometimes user accidentally erased their important data from the Storage devices. Users have to know how data reco…
Healthcare organizations in the United States must adhere to the guidance of both the HIPAA (Health Insurance Portability and Accountability Act) and HITECH (Health Information Technology for Economic and Clinical Health Act) for securing and protec…
Viewers will learn how to use the Hootsuite Dashboard.
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question