If the shell is Zsh, the variable $ZSH_VERSION is defined. Likewise for Bash and $BASH_VERSION. if [ -n “$ZSH_VERSION” ]; then # assume Zsh elif [ -n “$BASH_VERSION” ]; then # assume Bash else # assume something else fi However, these variables only tell you which shell is being used to run the above code. … Read more
The dot command ‘.‘ is the equivalent of the C Shell (and Bash) source command. It is specified by POSIX (see dot), and supported by the Bourne and Korn shells (and zsh, I believe). . somefile Note that the shell looks for the file using $PATH, but the file only has to be readable, not … Read more
You should use shuf command =) cat file1 file2 | shuf Or with Perl : cat file1 file2 | perl -MList::Util=shuffle -wne ‘print shuffle <>;’
The bang bang (!!) command is a shortcut to repeat the previous command you entered in your terminal. This command is very useful when you forget that you need admin rights to make a certain action, and lets you repeat it with super-user rights just by typing sudo !! instead of typing arrow-up, scrolling to … Read more
The POSIX-shell (sh) counterpart of $BASH_SOURCE is $0. see bottom for background info Caveat: The crucial difference is that if your script is being sourced (loaded into the current shell with .), the snippets below will not work properly. explanation further below Note that I’ve changed DIR to dir in the snippets below, because it’s … Read more
cp -RT source/ destination/ All files and directories in source will end up in destination. For example, source/file1 will be copied to destination/file1. The -T flag stops source/file1 from being copied to destination/source/file1 instead. (Unfortunately, cp on macOS does not support the -T flag.)
zsh uses env profile ~/.zshrc, not ~/.bashrc. so you need to append your env settings to .zshrc file and then source ~/.zshrc It must work. rbenv github link
Yes. Bash scripts are sensitive to line-endings, both in the script itself and in data it processes. They should have Unix-style line-endings, i.e., each line is terminated with a Line Feed character (decimal 10, hex 0A in ASCII). DOS/Windows line endings in the script With Windows or DOS-style line endings , each line is terminated … Read more
As already mentioned, the location will be where the script was called from. If you wish to have the script reference it’s installed location, it’s quite simple. Below is a snippet that will print the PWD and the installed directory: #!/bin/bash echo “Script executed from: ${PWD}” BASEDIR=$(dirname $0) echo “Script location: ${BASEDIR}”
Use: wget http://somesite.com/TheFile.jpeg -q –show-progress -q: Turn off wget‘s output –show-progress: Force wget to display the progress bar no matter what its verbosity level is set to