On OSX the Activity Monitor gives you actually a very good guess. Private memory is for sure memory that is only used by your application. E.g. stack memory and all memory dynamically reserved using malloc() and comparable functions/methods (alloc method for Objective-C) is private memory. If you fork, private memory will be shared with you … Read more
xxd -p file Or if you want it all on a single line: xxd -p file | tr -d ‘\n’
Use find: find . -name \*.txt -print On systems that use GNU find, like most GNU/Linux distributions, you can leave out the -print.
As @Tommy suggested, you should use update-alternatives. It assigns values to every software of a family, so that it defines the order in which the applications will be called. It is used to maintain different versions of the same software on a system. In your case, you will be able to use several declinations of … Read more
The distinction between a real and an effective user id is made because you may have the need to temporarily take another user’s identity (most of the time, that would be root, but it could be any user). If you only had one user id, then there would be no way of changing back to … Read more
the solution is easy: execute via sh … -exec sh -c “zcat {} | agrep -dEOE ‘grep’ ” \;
I don’t know about sed, but it can be done with head: head -n -2 myfile.txt
Try linux command chsh. The detailed command is chsh -s /bin/bash. It will prompt you to enter your password. Your default login shell is /bin/bash now. You must log out and log back in to see this change. The following is quoted from man page: The chsh command changes the user login shell. This determines … Read more
date +”%T.%N” returns the current time with nanoseconds. 06:46:41.431857000 date +”%T.%6N” returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds. 06:47:07.183172 date +”%T.%3N” returns the current time with nanoseconds rounded to the first 3 digits, which is milliseconds. 06:47:42.773 In general, every field of the date command’s format can … Read more
Try this (not sure if it’s the best way, but it works): find . -type f | perl -ne ‘print $1 if m/\.([^.\/]+)$/’ | sort -u It work as following: Find all files from current folder Prints extension of files if any Make a unique sorted list