Jun 3, 2012 · Also be aware that commands called from bash -c will be forced to singlethreading. eg: "bash -c 'ffmpeg -threads 4 -i input.mov output.mp4'" will call ffmpeg but it can only use one core even though you specified the "threads" parameter –

Jul 17, 2012 · Then both processes (the shell and the child) redirect their stdin and stdout to the same files. I think you were trying to save the previous fd in current_out , but as Seth Robertson points out, this doesn't currently work, since the wrong file descriptor is being saved.

Oct 26, 2012 · FYI, some people may be forced to use CSH due to vendor hardware - as in the case of ASML equipment, for example.

Oct 25, 2010 · If you don't have a choice with the shell, I agree it's not helpful. I however didn't know that an if you did have a choice, it's useful to have some information which you can use to make a decision. That was my intent (and it's why I put it as a comment rather than an answer).

Feb 18, 2015 · I would like to create a list that will contain strings that apply to certain conditions in csh. How do I add to a list or array in a dynamic way without pre determining the size of the list or the

Aug 5, 2010 · The corollary to this is to get the "run program to set variables" behavior in the shell you 1) write a shell script to do the job and 2) don't run it the usual way, but rather source it. (BTW in most shells . script is the same as source script and a lot less typing.)

I am trying to implement a shell in C. I can execute simple commands just fine with a simple execvp() but one of the requirements is to manage commands like this: "ls -l | head | tail -4" with a 'for' loop and only one 'pipe()' statement redirecting stdin and stdout. Now after days I'm a bit lost.

Jan 9, 2015 · Basically I have created a shell using standard POSIX commands, I want to be able to Implement Piping as well. Right now it handles commands correctly, and can do background processing with &. ...

Jun 15, 2015 · I am new to c shell. Perfect! That means this is a great time to switch to a shell that's more programmer-friendly, like bash or even sh. bash supports arrays, though the syntax is a bit less convenient than csh's -- but bash's behavior is more consistent.

Apr 25, 2021 · lastdir is a global char array.*lastdir is the same as lastdir[0], the first byte of the array.If this byte is null, the previous current directory is unknown, either because the shell never changed directories or because it changed from an invalid directory, which is possible if the current directory was removed, as would happen after: mkdir foo; cd foo; rmdir ../foo.