Is there a way to tell the Linux kernel to only use a certain percentage of memory for the buffer cache? I know /proc/sys/vm/drop_caches can be used to clear the cache temporarily, but is there any permanent setting that prevents it from growing to more than e.g. 50% of main memory?
Ex.: an sshd is configured to only listen on wlan0. So. Besides checking the sshd_config how can I check that a daemon is listening on what inerface? netstat can do it? how? (OS: openwrt or scientific linux or openbsd)
I have a Debian system working as a wireless router with eth0 and wlan0. Now I added an additional network manually on eth1 with ifconfig:
I have some trouble to understand what is happening here:
Before I install a package, I’d like to know what version I would get.
I just spun up an Ubuntu 11.10 box and then ran apt-get install apache2 php5 to install apache2 and PHP 5 on the box. Now it is functioning as a “web server” and it loads the “It Works!” page. Now I’m trying to tighten up security and I have the following questions about linux web servers:
I searched SO and found that to uppercase a string following would work
I don’t think the shell/utilities in historical Unix nor in something as “recent” as 4.4BSD supported using a double-dash(or two consecutive hyphens) as an end of options delimiter. With FreeBSD, you can see for instance a note introduced in the rm manpages with the 2.2.1 release(1997). But this is just the documentation for one command.
I’m looking for the simplest method to print the longest line in a file. I did some googling and surprisingly couldn’t seem to find an answer. I frequently print the length of the longest line in a file, but I don’t know how to actually print the longest line. Can anyone provide a solution to print the longest line in a file? Thanks in advance.