There is no difference if you do not put $* or $@ in quotes. But if you put them inside quotes (which you should, as a general good practice), then $@ will pass your parameters as separate parameters, whereas $* will just pass all params as a single parameter. Take these scripts (foo.sh and bar.sh) … Read more
The docker package already inside Ubuntu is called docker.io [1] so just do sudo apt-get install docker.io But if you follow that link you gave and do steps 7, 8, 9 then your installation will know about the package at the docker repo and also find docker-engine. Your call. I run the Ubuntu version (currently … Read more
dtc -O dts sudo apt-get install device-tree-compiler dtc -I dtb -O dts -o a.dts a.dtb gives a well indented textual representation of the device tree a.dtb, which is easy to understand with a text editor. Or dump it to stdout with: dtc -I dtb -O dts -o – a.dtb The source code for dtc is … Read more
Lots of type casts are going to just “work well”. However, this is not very strict. Nothing stops you from casting a u32 to a u32 * and dereference it, but this is not following the kernel API and is prone to errors. __iomem is a cookie used by Sparse, a tool used to find … Read more
I wanted to add how I fixed this problem / customized my environment. There are 2 logging mechanisms working here: bin/zkServer.sh redirects the zookeeper server’s stdout and stderr to zookeeper.out log4j can append to logs to several places including: CONSOLE – which ends up in zookeeper server’s stdout and stderr ROLLINGFILE – which is sent … Read more
$? is a variable holding the return value of the last command you ran. Example C program (example.c): int main() { return 1; } Example Bash: gcc -o example example.c ./example echo $? # prints 1
Use printf (1): x=’a real \good %* load of c$rap’ x=$(printf ‘%q’ “$x”) echo $x will return a\ real\ \\good\ %\*\ load\ of\ c\$rap
I have no idea what Yesod is, but I know exactly what each of your other errors means. First, you should not try to link statically. The warning you get is exactly right: if you link statically, and use one of the routines for which you are getting the warning, then you must arrange to … Read more
You just need to add a From: header. By default there is none. echo “Test” | mail -a “From: Someone <[email protected]>” [email protected] You can add any custom headers using -a: echo “Test” | mail -a “From: Someone <[email protected]>” \ -a “Subject: This is a test” \ -a “X-Custom-Header: yes” [email protected]
Print list of all repositories to get repo id (first column): $ dnf repolist Now remove all packages of selected repo: # dnf repository-packages <repo-id> remove See repository-packages section of dnf manual page for details regarding manipulation with all packages in specific repository.