如果if 语句使用的是双层方括号[[ ]]条件修饰符, 变量就不需要引号了 #!/usr/bin/env bashtemp=$(command-v nvm)echo$tempif[[$temp== nvm ]];thenecho"❌ nvm not exist, trying to re-install it ... ⏳"elseecho"nvm had been installed ✅"fiechofinished 🎉 #!/usr/bin/env bashtemp...
Hit return and you should be the happy owner of a new Twilio phone number (if you aren't, it's possible the number was already purchased by someone else - re-run the 'available number' step and try again). If you're eagle-eyed, you'll probably notice: We're now usin...
When the heredoc is used in any script, it is necessary to keep the same name for the starting and ending delimiter. Suppose the command is `cat` and the heredoc delimiter isADDTEXT. Create a bash script file namedheredoc1.bashwith the following code to check the simple use of heredoc. ...
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However, if you find yourself in need of a different way to mimic the behavior of other shells, let’s take a look at theemulatecommand. 2. Using theemulateCommand To emulate another shell inzsh, you can use the emulate builtin command. For example, to emulate the Bash shell, you can...
You can also use the following command for common shells for instance in bash, ksh, csh, to pass arguments tobcas shown. $ bc -l <<< "2*6/5"2.40000000000000000000 Let’s look at how to usebcnon-interactively, this is also useful for shell scripting purposes. ...
In order to run Bastille, run the following command: sudo bastille Note:Bastille has two working modes: CLI (command-line interface) and GUI (graphical user interface). If you were working with a desktop system with X-based interactive (graphical) interface, you could use its GUI by...
If you have OpenSSL installed, but with the libraries in one place and the header files somewhere else, you have to set the LDFLAGS and CPPFLAGS environment variables prior to running configure. Something like this should work: (with the Bourne shell and its clones): ...
It seems to me that while individual interpretations of a system’s purpose can and will vary, not all can dictate its operational use. Someone (group or individual) must be able to have a final say on this, at least to lock something in at a point in time to enable people to converg...
if [ -f ~/.bashrc ]; then . ~/.bashrc fi # User specific environment and startup programs PATH=$PATH:$HOME/.local/bin:$HOME/bin export PATH The.bash_profilecan also be used to define a custom shell prompt, define one's editor of choice, or anything else that you want to place ...