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英文字典中文字典相关资料:


  • shell - Bash regex =~ operator - Stack Overflow
    The [[ ]] is treated specially by bash; consider that an augmented version of [ ] construct: [ ] is actually a shell built-in command, which, can actually be implemented as an external command Look at your usr bin, there is most likely a program called "[" there! Strictly speaking, [ ] is not part of bash syntax
  • linux - Difference between ${} and $() in Bash - Stack Overflow
    your understanding is right For detailed info on {} see bash ref - parameter expansion 'for' and 'while' have different syntax and offer different styles of programmer control for an iteration Most non-asm languages offer a similar syntax
  • Whats the meaning of the parameter -e for bash shell command line?
    Ah yes, I suspected this was from set but wanted to see it in the manual I was wondering why I didn't see it in man bash, it's because I went straight to the options listed and missed the paragraph that said "All of the single-character shell options documented in the description of the set builtin command, including -o, can be used as options when the shell is invoked"
  • How do I get the directory where a Bash script is located from within . . .
    ${BASH_SOURCE[0]} - the full path to the script The value of this will be correct even when the script is being sourced, e g source <(echo 'echo $0') prints bash, while replacing it with ${BASH_SOURCE[0]} will print the full path of the script (Of course, this assumes you're OK taking a dependency on Bash )
  • bash - Whats the difference between $@ and - Unix Linux Stack Exchange
    You can review Bash Beginners Guide for more information These to do pretty much the same thing with the difference of how it's separated:
  • How do I split a string on a delimiter in Bash? - Stack Overflow
    Split string based on delimiter in bash (version >=4 2) In pure bash, we can create an array with elements split by a temporary value for IFS (the input field separator) The IFS, among other things, tells bash which character(s) it should treat as a delimiter between elements when defining an array:
  • Way to create multiline comments in Bash? - Stack Overflow
    Multiline comment in bash: <<'END_COMMENT' This is a heredoc (<<) redirected to a NOP command (:) The single quotes around END_COMMENT are important, because it disables variable resolving and command resolving within these lines Without the single-quotes around END_COMMENT, the following two $() `` commands would get executed: $(gibberish
  • How to evaluate a boolean variable in an if block in bash?
    Calling which true in bash, zsh, ksh, dash, and fish, it seems that only zsh has true and false as built-ins Seems like a sensible thing for shells to implement though! – Christopher Shroba Commented Sep 13, 2020 at 13:39
  • bash - Parsing JSON with Unix tools - Stack Overflow
    Bash 4 and later, zsh, and ksh have support for arrays and associative arrays, but these shells are not universally available (macOS stopped updating Bash at Bash 3, due to a change from GPLv2 to GPLv3, while many Linux systems don't have zsh installed out of the box) It's possible that you could write a script that would work in either Bash 4 or zsh, one of which is available on most macOS





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