lDisplay open files for a process: if lsof(1) is installed, pressing this key will display the list of file descriptors opened by the process. sTrace process system calls: if strace(1) is installed, pressing this key will attach it to the currently selected process, presenting a live update of system calls issued by the process. U Untag all processes (remove all tags added with the Space key).

Commands that can operate on multiple processes, like “kill”, will then apply over the list of tagged processes, instead of the currently highlighted one. htop Usage Command-line Options -d -delay=DELAY Delay between updates, in tenths of seconds -C -no-color -no-colour Start htop in monochrome mode -h -help Display a help message and exit -u -user=USERNAME Show only the processes of a given user -p Start working thread for pagemap memory stats -s -sort-key COLUMN Sort by this column (use –sort-key help for a column list) -v -version Output version information and exit Interactive Commands Arrows, PgUP, PgDn, Home, End Scroll the process list. Its name is derived from the original author’s first name, as a nod to pinfo, an info-replacement program that does the same. Htop is written in the C programming language using the ncurses library. Compared to top, it provides a more convenient, visual, cursor-controlled interface for sending signals to processes.

htop is also popularly used interactively as a system monitor. Users often deploy htop in cases where Unix top does not provide enough information about the system’s processes. Htop uses color and gives visual information about processor, swap and memory status. Unlike top, htop provides a full list of processes running, instead of the top resource-consuming processes. Htop shows a frequently updated list of the processes currently running, normally ordered by the amount of CPU usage.

To install sudo apt-get install htop To run htop

Linux monitor process memory