Try setting C_INCLUDE_PATH (for C header files) or CPLUS_INCLUDE_PATH (for C++ header files). As Ciro mentioned, CPATH will set the path for both C and C++ (and any other language). More details in GCC’s documentation.
General rule: quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many. $? doesn’t need quotes since it’s a numeric value. Whether $URL needs it depends on what you … Read more
To execute a cmd before every command entered, set a trap on DEBUG. Eg. trap date DEBUG To execute that command before emitting a prompt, set PROMPT_COMMAND: PROMPT_COMMAND=date
You cannot, at least not for the process being killed. What you can do is arrange for the parent process to watch for the child process’s death, and act accordingly. Any decent process supervision system, such as daemontools, has such a facility built in.
First of all, you should consider broadcast obsolete, specially INADDR_BROADCAST (255.255.255.255). Your question highlights exactly one of the reasons that broadcast is unsuitable. It should die along with IPv4 (hopefully). Note that IPv6 doesn’t even have a concept of broadcast (multicast is used, instead). INADDR_BROADCAST is limited to the local link. Nowadays, it’s only visible … Read more
No, it is not ok. All commands in a pipeline execute at the same time, and the shell prepares redirections before executing the commands. So, it is likely that the command will overwrite the file before cat reads it. You need sponge(1) from moreutils.
Try this: Save the script as apt-proxy (without the .sh extension) in some directory, like ~/bin. Add ~/bin to your PATH, typing export PATH=$PATH:~/bin If you need it permanently, add that last line in your ~/.bashrc. If you’re using zsh, then add it to ~/.zshrc instead. Then you can just run apt-proxy with your arguments … Read more
Have a look at this. Starting with version 2.5, linux kernel introduced a new system call entry mechanism on Pentium II+ processors. Due to performance issues on Pentium IV processors with existing software interrupt method, an alternative system call entry mechanism was implemented using SYSENTER/SYSEXIT instructions available on Pentium II+ processors. This article explores this … Read more
A solution using find: To rename files only: find /your/target/path/ -type f -exec rename ‘s/special/regular/’ ‘{}’ \; To rename directories only: find /your/target/path/ -type d -execdir rename ‘s/special/regular/’ ‘{}’ \+ To rename both files and directories: find /your/target/path/ -execdir rename ‘s/special/regular/’ ‘{}’ \+
This link contains a good checklist why core dumps are not generated: The core would have been larger than the current limit. You don’t have the necessary permissions to dump core (directory and file). Notice that core dumps are placed in the dumping process’ current directory which could be different from the parent process. Verify … Read more