Conditionally perform a command several times.

The operation of the FOR command can be summarised as..

• Take a set of data
• Make a FOR Parameter %%G equal to some part of that data
• Perform a command (optionally using the parameter as part of the command).
• Repeat for each item of data

If you are using the FOR command at the command line rather than in a batch program, use just one percent sign: %G instead of %%G.

FOR Parameters

The first parameter has to be defined using a single character, for example the letter G.
FOR %%G IN ..
In each iteration of a FOR loop, the IN ( ..) clause is evaluated and %%G set to a different value
If this clause results in a single value then %%G is set equal to that value and the command is performed.
If the clause results in a multiple values then extra parameters are implicitly defined to hold each. These are automatically assigned in alphabetical order %%H %%I %%J ..(implicit parameter definition)

If the parameter refers to a file, then enhanced variable reference can be used to extract the filename/path/date/size.

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You can of course pick any letter of the alphabet other than %%G.
%%G is a good choice because it does not conflict with any of the pathname format letters (a, d, f, n, p, s, t, x) and provides the longest run of non-conflicting letters for use as implicit parameters.
G > H > I > J > K > L > M
Format letters are case sensitive, so using a capital letter is also a good way to avoid conflicts %%A rather than %%a.

Examples

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FOR /F 'tokens=1-5' %%A IN ('This is a short sentence') DO @echo %%A %%B %%D

will result in the output: This is short

Create a set of 26 folders, one for each letter of the alphabet:

FOR %%G IN (a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z) DO (md C:demo%%G)

Using variables within a FOR loop

Variables are expanded at the start of a FOR loop and don’t update until the entire DO section has completed.
The following example counts the files in the current folder, but %count% always returns 1:

@echo off
SET count=1
FOR /f 'tokens=*' %%G IN ('dir /b') DO (
echo %count%:%%G
set /a count+=1 )

To update variables within each iteration of the loop we must either use EnableDelayedExpansion or else use the CALL :subroutine mechanism as shown below:

@echo off
SET count=1
FOR /f 'tokens=*' %%G IN ('dir /b') DO (call :subroutine '%%G')
GOTO :eof
:subroutine
echo %count%:%1
set /a count+=1
GOTO :eof

Nested FOR commands

FOR commands can be nested FOR %%G.. DO (for %%U.. do ..)
when nesting commands choose a different letter for each part. you can then refer to both parameters in the final DO command.

For an example of exiting the inner loop of two nested FOR loops, see the EXIT page.
If Command Extensions are disabled, the FOR command will only support the basic syntax with no enhanced variables:
FOR %%parameter IN (set) DO command [command-parameters]

Errorlevels

The FOR command does not generally set any errorlevels, leaving that to the command being called.
One exception is using a wildcard, if the wildcard does not match any files, then FOR will return %ERRORLEVEL% = 5

FOR does not, by itself, set or clear the Errorlevel.
FOR is an internal command.
“Those who cannot remember the past are condemned to repeat it” - George Santayana
Related:
FOR - Loop through a set of files in one folder.
FOR /R - Loop through files (recurse subfolders) .
FOR /D - Loop through several folders.
FOR /L - Loop through a range of numbers.
FOR /F - Loop through items in a text file.
FOR /F - Loop through the output of a command.
Parameters/arguments %~ options.
FORFILES - Batch process multiple files.
GOTO - Direct a batch program to jump to a labelled line.
IF - Conditionally perform a command .
Powershell: ForEach-Object - Loop for each object in the pipeline.
Equivalent bash command (Linux): awk or for var in [list]; do - Expand list, and execute commands.

Softmatic® BarcodeFactory™ is the perfect multiple barcode automator, a tool for automatic batch creation of barcodes on your Mac. Generate serial, consecutive barcode sequences with counters. Importing data from CSV or TXT files to batch create barcodes is also supported or simply paste your tabular data from Apple Numbers or Microsoft Excel. Make thousands of barcodes automatically with only a few button clicks. Stand-alone, self contained software - no plug-ins, external components, barcode fonts, or online access required! Also available for Windows. Click image to enlarge

macOS 10.7 or higher

Screenshot shows Softmatic BarcodeFactory creating EAN barcodes from imported data. Per default the imported numbers are also used for naming the generated files. Users can override this anytime by double-clicking in the respective row and entering their own file names. Additional data like price, product description, best-before date can be put above and below the barcode.

Create Sequential Barcodes

Sequential numbers can be created by the built-in barcode number generator. An easy to use dialog lets you specify start value, number of barcodes, step etc. Additionally, static bits of text can be added before and after the number:
Click image to enlarge
Click Ok and the numbers are created and converted into Code 128 barcodes or any other supported symbology:
Click image to enlarge
Useful for asset tagging with barcodes, admission tickets or similar purposes. You can also set static prefix and postfix strings that are added to the generated number.

Create Barcodes from imported CSV, TXT files

Import data from CSV / TXT files. BarcodeFactory can pull data and filename for the generated barcodes from the file. Additional data can be put above and below the barcode, like pricing information, product name, best-before dates etc.
Data is easily specified line by line, the fields separated by comma (separator user defineable):
'4012345678901,Müllermilch 100ml,Nur € 1.99,file_4012345678901'
Results in this barcode with text and pricing above and below the code, written to file file_4012345678901:

Generate Barcodes from Tabular Data, Spreadsheets, Excel / Numbers

Besides importing data from a file, you can also copy / paste tabular data over the pasteboard, e.g. a range of cells from your Numbers or Excel spreadsheet. Here we have a sample Numbers sheet with product data.
Each row consists of the product's EAN number, the product description, price and EAN again:
Click image to enlarge
Select the whole range of cells and cmd-c to copy to the pasteboard. In BarcodeFactory, use the Preferences dialog to set the field separator to TAB. Then select Data Source > Paste and the product table is automatically imported and converted to EAN barcodes:
Click image to enlarge
The EAN no. from the first column is encoded into the EAN barcode, description and price are placed above and below the code, respectively and the EAN from the fourth column is used for the filename. Now simply click Generate Barcodes.. and the EAN images are written to disk automatically - no matter if it's only 20 or 20,000.
It doesn't get simpler than that!

Manual entry of data, random barcodes

Simply enter your barcode data one-by-one or use the built in number generator for random numbers like GUIDs numeric or numerical random barcodes created with fixed length. For license keys, sweepstakes, lottery barcodes etc.

Softmatic BarcodeFactory Features

Supported codes & symbologies:

• EAN 8, EAN 13
• UPC-E, UPC-A
• Code 2/5 Interleaved, Industrial
• Code ITF-14
• Code 39, Code 39 Extended
• Code 128 ABC w/ auto-discrimination
• Code 128 GS1/UCC/EAN
• Codabar
• PZN 7 / PZN 8 (pharma code)
• DataBar GS1 (formerly RSS symbology), all seven subtypes including stacked and expanded
• 2D: Datamatrix, Aztec, PDF417, QR Code

Output naming options:

• Use the encoded data for the file name, automatic, can be overriden by user anytime
• Get filename from the imported files or pasted tabular data

Sample Applications:

• Mass creation of QR cellphone barcodes or other 2D codes for tickets, vouchers and coupons
• Importing batch created barcodes into Excel tables via VBA or add-in, ideal for price lists, inventories etc.
• Use Indesign data merge for creating catalogs, labels with barcodes etc. (Tutorial):
  Click image to enlarge
  
• Creating personalized barcodes for bulk email, mass mailings, like invitations
• Creating personalized barcodes for ID cards or business cards
• Unique barcodes (encoding a GUID) for license numbers, product keys, ticketing etc.
• Sequential barcodes with serial numbers for asset tagging

Softmatic BarcodeFactory Export and Code Generation

Softmatic BarcodeFactory for Mac will automatically generate all required check digits (linear codes) and error correction codewords (2D codes). Export formats include EPS / SVG (vector) and PNG, TIFF, JPEG (raster) with up to 3200 dpi output resolution. The software supports bar width reduction and can generate bounding box markers if so desired. For EAN family codes, Softmatic BarcodeFactory supports EAN SC sizes, light margin marker (aka 'sentinel') and height truncation.
Softmatic BarcodeFactory for Mac is fully multi-threaded and will use all available CPU cores for code generation, creating thousands of barcodes in only seconds.

Try Softmatic BarcodeFactory for Mac

Softmatic® BarcodeFactory (Mac, macOS 10.7 or higher)
Download for Mac
Fully functional, all supported code types, the output is restricted to lower resolution. See the folder Sample Barcodes in the ZIP for EPS samples.

Purchase Softmatic BarcodeFactory for Mac

Pricing and license options in the online store.

Praise for Softmatic Barcode Software

★★★★★
'Does exactly what I need for generating ISSN and ISBN barcodes for books and journals. I was extremely pleased to be able to try the software out by visiting the Softmatic website. This enabled me to establish the level that I needed before purchase. Really simple to use and good value. Check digit and add-on functionality works perfectly.'

- UK Customer

★★★★★
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★★★★
'Real nice software for barcoding. Does what is says. I could use a preset funtion in a future update, for maintaining different sizes in a series of packaging designs.'

- Dutch Customer

★★★★★
'This application really couldn't be easier to use. Simply select the barcode type that you need, then type (or paste) your barcode number. Save. That's it. It would be nice to be able to save presets.. - ..but these are minor quibbles considering the price of this application.'

- UK Customer