Revised Answer (Feb 12, 2014) Original Answer Caveats: https://stackoverflow.com/a/21210966/89391 From: Using boolean variables in Bash The reason the original answer is included here is because the comments before the revision on Feb 12, 2014 pertain only to the original answer, and many of the comments are wrong when associated with the revised answer. For example, Dennis Williamson’s … Read more
sed is the Stream EDitor. It can do a whole pile of really cool things, but the most common is text replacement. The s,%,$,g part of the command line is the sed command to execute. The s stands for substitute, the , characters are delimiters (other characters can be used; /, : and @ are popular). The % is the pattern to match (here a literal percent sign) and the $ is the second pattern … Read more
You could use printf instead: printf has more consistent behavior than echo. The behavior of echo varies greatly between different versions.
This is one of those things that can be difficult to search for if you don’t already know where to look. [ is actually a command, not part of the bash shell syntax as you might expect. It happens to be a Bash built-in command, so it’s documented in the Bash manual. There’s also an external … Read more
I’m on a Mac running El Capitan. I have node v5.6.0 and npm v3.6.0. When I try to run nodemon, I get: I thought this may mean that I didn’t have nodemon installed, so when I tried to install it using… …I get this: If it makes a difference, I’m trying to run nodemon on … Read more
from manual: : [arguments] No effect; the command does nothing beyond expanding arguments and performing any specified redirections. A zero exit code is returned. As this returns always zero therefore is is similar to be used as true Check out this answer: What Is the Purpose of the `:’ (colon) GNU Bash Builtin?
If you know you’re always going to use Bash, it’s much easier to always use the double bracket conditional compound command [[ … ]], instead of the POSIX-compatible single bracket version [ … ]. Inside a [[ … ]] compound, word-splitting and pathname expansion are not applied to words, so you can rely on to compare the value of $aug1 with … Read more
This reads: search recursively (in all sub directories also) for all .cc OR .h files that contain “hello” at this . (current) directory From another stackoverflow question
The simplest way would be to add an alias to python3 to always point to the native python installed. Add this line to the .bash_profile file in your $HOME directory at the last, Doing so makes the changes to be reflected on every interactive shell opened.
What you have should work, unless ${STATUS} is empty. It would probably be better to do: or It’s hard to say, since you haven’t shown us exactly what is going wrong with your script. Personal opinion: never use [[. It suppresses important error messages and is not portable to different shells.