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  • What is the meaning of $? in a shell script?
    This latter usage is faster, does not contaminate the shell's variable namespace with what amounts to temp variables, can often be a lot more readable for humans and encourages the use of "positive logic", the practice of writing
  • What does $# mean in shell? - Unix Linux Stack Exchange
    What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things
  • How do I remove a directory and all its contents?
    If rm -r doesn't work, that would be an OS issue, not a shell issue (Strictly speaking, it would be an issue with the version of rm that you're using, so you could address it by installing a different version of rm , or searching your system to see whether you already have a different version of rm in some directory other than bin )
  • Running a shell command as root - Unix Linux Stack Exchange
    Running a shell command as root sudo (preferred when not running a graphical display) This is the preferred method on most systems, including Ubuntu, Linux Mint, (arguably) Debian, and others If you don't know a separate root
  • How to go to the previous working directory in terminal?
    The echo shows the new directory not the previous one And I would find it useful, so that I know where I am now, especially if I'm in a shell that only shows the current directory name (or nothing at all) on the prompt, and I'm too unbothered to change the prompt to show the full path
  • bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange
    Here documents are commonly used in shell scripts to create whole files or to display long messages cat > some-file <<FILE foo bar bar bar foo foo FILE < passes the contents of a file to a command's standard input
  • missing `] error in unix shell script - Unix Linux Stack . . .
    Better shell solution when blank lines may be piped to wc 1 Set comparator with variables within a variable, then have shell expand those variables each time it's echo'd
  • Shell scripting: -z and -n options with if
    You can find a very nice reference for bash's [aka test builtin's operators here, or by running help test in a bash shell or info bash test or info bash '[' from any shell¹ If you are using a different shell, just search for the description of its [ or test builtin in its documentation of if it doesn't have such a builtin², in the man page of the standalone test utility³ and you will find
  • Possible to match multiple conditions in one case statement?
    The more special-case "tricks" you have in your code, the harder it will be for anyone to maintain Shell is tricky enough as it is without using once-in-a-lifetime syntax In 27 years of writing shell scripts, I have never had a need
  • How to conditionally do something if a command succeeded or . . .
    It's probably the most common command to use in an if, which can lead to the assumption that it's part of the shell's syntax But if you want to test whether a command succeeded or not, use the command itself directly with if , as shown above





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