I need to create a nice installer for a Mac application. I want it to be a disk image (DMG), with a predefined size, layout and background image. I need to do this programmatically in a script, to be integrated in an existing build system (more of a pack system really, since it only create … Read more
I can express my need with the following scenario: Write a function that accepts a string to be run as a native command. It’s not too far fetched of an idea: if you’re interfacing with other command-line utilities from elsewhere in the company that supply you with a command to run verbatim. Because you don’t … Read more
Given an absolute or relative path (in a Unix-like system), I would like to determine the full path of the target after resolving any intermediate symlinks. Bonus points for also resolving ~username notation at the same time. If the target is a directory, it might be possible to chdir() into the directory and then call … Read more
I have a PowerShell script for which I would like to redirect the output to a file. The problem is that I cannot change the way this script is called. So I cannot do: .\MyScript.ps1 > output.txt How do I redirect the output of a PowerShell script during its execution? 10 Answers 10
I run across many shell scripts with variables in all caps, and I’ve always thought that there is a severe misunderstanding with that. My understanding is that, by convention (and perhaps by necessity long ago), environment variables are in all-caps. But in modern scripting environments like Bash, I have always preferred the convention of lower-case … Read more
I need to generate a random port number between 2000-65000 from a shell script. The problem is $RANDOM is a 15-bit number, so I’m stuck! PORT=$(($RANDOM%63000+2001)) would work nicely if it wasn’t for the size limitation. Does anyone have an example of how I can do this, maybe by extracting something from /dev/urandom and getting … Read more
I have a shell script that has user execution permission on OS X, but when I double click on it, it opens in a text editor. How can I get it to run by double-clicking it? 8 Answers 8
What does echo $? mean in shell programming? 8 Answers 8
I normally have several problems with how cron executes scripts as they normally don’t have my environment setup. Is there a way to invoke bash(?) in the same way cron does so I could test scripts before installing them? 14 Answers 14
Suppose you have a file that contains IP addresses, one address in each line: 10.0.10.1 10.0.10.1 10.0.10.3 10.0.10.2 10.0.10.1 You need a shell script that counts for each IP address how many times it appears in the file. For the previous input you need the following output: 10.0.10.1 3 10.0.10.2 1 10.0.10.3 1 One way … Read more
