I find first example of Shake usage demonstrating a pattern that seems error prone:
contents <- readFileLines $ out -<.> "txt"
need contents
cmd "tar -cf" [out] contents
Why do we need need contents when readFileLines reads them and cmd references them? Is this so we can avoid requiring ApplicativeDo?
I think part of the confusion may be the types/semantics of contents. The file out -<.> "txt" contains a list of filenames, so contents is a list of filenames. When we need contents we are requiring the files themselves be created and depended upon, using the filenames to specify which files. When we pass contents on to cmd we are passing the filenames which tar will use to query the files.
So the key point is that readFileLines doesn't read the files in question, it only reads the filenames out of another file. We have to use need to make sure that using the files is fine, and then we actually use the files in cmd. Another way of looking at the three lines is:
Which files do we want to operate on?
Make sure those files are ready.
Use those files.
Does that make sense? There's no relationship with ApplicativeDo - it's presence wouldn't help us at all.
Related
I need something that can copy a specified file any and everywhere on my drive (or computer) where that file already exists; i.e. update a file. I tried to search this site, in case I'm not the first, and found this:
CMD command line: copy file to multiple locations at the same time
But not quite the same.
Example:
Say I have a file called CurrentList.txt, and I have copies of it all over my hard drive. But then I change it and I want all the copies to update. So I want to copy the newer one over all the others. It could 'copy if newer', but generally I know it's newer, so it could also just find every instance and copy over it.
I was originally going to use some kind of .bat file that would have to iterate over every folder seeking the file in question, but my batch file programming is limited/rusty. Then I looked to see if xcopy could do it, but I don't think so...
For how I will use it most, I generally know where those files are going to be, so it actually might be as good or better if I could specify it to (using example), "copy CurrentList.txt, overwriting all other copies wherever found in the C:\Lists folder and all subfolders".
I would really like to be able to have it in a context menu, so I could (from a file explorer) right click on a file or selected files and choose the option to distribute it.
Thanks in advance for any ideas.
Use the "replace" command...
replace CurrentList.txt C:\Lists /s
I'm trying to make an batch file that will copy the contents of a .cfg file into another .cfg file. The problem I'm having is that I want the contents of the first file to be placed at specific lines of the destination file, for example, placing the contents between line 300 and 343 and overwriting the original content within those lines.
Any way of doing this?
If there isn't a way to detect specific lines maybe there is a way to detect a specific string, like an ID?
If you are allowed to use 3rd party tools in your environment you can use a regex CLI tool to find and then replace the lines / values you need. The tool can be called using batch scripts.
Example Tools from another question:
https://superuser.com/questions/339118/regex-replace-from-command-line
I need to check the files of a versioned system. To do that, I need to write a batcha program so to compare the contents of several folders containing the repositories.
So, my question is: how can I "read" the names of all the subfolders inside a folder, so to use these names later to find subfolders having the same names in a different repositories?
I suppose I may use DIR to print on the screen a list of these names but I don't know how to write it on a text file and then read it. Moreover, I should edit this kind of list, anyway.
Any suggestions or new ideas to solve this problem?
I thank gratefully who ever will answer.
it seems that you can get the subfolders using batch file from perl as follows:
system("start C:\\Temp\\mybatchfile.bat");
or you might try to pass your command suggested by #Stephan straight to system and try to handle what it is returned.
First off I want to say that
-I didnt ever create a batch file yet, but I am really willing to learn
-I am not even sure if what i want to do is possible with a batch file
What i want to do is the following:
I want to replace a number of files of one file type in a folder each with one and the same file of another file type. In doing this, i want the "replaced" files to keep their original name except for the "replacer" file's extension. I am not talking about file conversion, this is about replacing several different files each with one and the same file, so each of them will look the same later, just with different names and the file extension of the "replacer" file. All of the files inside the folder are to be treated this way, there are no exceptions.
So it looks something like this:
Folder 1 Folder 2
10000000.tga------------->10000000.png (looks like replacer.png)
10000001.tga------------->10000001.png (looks like replacer.png)
10000011.tga------------->10000011.png (looks like replacer.png)
I really hope that my description is sufficiently precise, if not so, I am of course willing to give any information needed. I found parts of what i need (e.g. a loop for files in a folder, an order to replace one file with another file) but I am unsure of how to combine them at all, let alone to achieve what I actually wanted to do.
Any help is greatly appreciated :)
for %%i in (*.tga) do (
copy "replacer.png" "%%~ni.png"
del "%%i"
)
see for /? for details about the %%~.. syntax
I have a problem when trying to upload multiple files to one WinSCP directory, i can manage to copy just one single file, but the problem is that i need to upload many files that are generated by a software, the names are not fixed ones, so i need to make use of wildcards in roder to copy all of them, i have tried many variants on the code, but it all was unsuccessful, the code i am using is:
open "sftp://myserver:MyPass#sfts.us.myserver.com" -hostkey="hostkey"
put "C:\from*.*" "/Myserverfolder/Subfolder/"
exit
This code does actually copy the first alphabetically named file, but it ignores the rest of the files.
Any help with it would be much appreciated
Try this in script
Lcd C:\from
Cd Myserverfolder/Subfolder
Put *
Try and do all manually first so you can see what's going on.