6. Other Useful Commands


shows file space and mounted systems.

ps aux

shows processes running. ps ax is a narrower form.

rm filename

remove filename.

rm -R dir

removes a directory dir and all subdirectories—careful!

ls -R

lists files in the current directory and all subdirectories; I used a variant, ls -AFR > where.txt, to get a list of all the files in / and (separately) /usr before I found better ways to find files.


to change user's password (or root's password)

man hier

manual page on the UNIX® filesystem

Use find to locate filename in /usr or any of its subdirectories with

% find /usr -name "filename"

You can use * as a wildcard in "filename" (which should be in quotes). If you tell find to search in / instead of /usr it will look for the file(s) on all mounted filesystems, including the CDROM and the DOS partition.

An excellent book that explains UNIX® commands and utilities is Abrahams & Larson, Unix for the Impatient (2nd ed., Addison-Wesley, 1996). There is also a lot of UNIX® information on the Internet.

All FreeBSD documents are available for download at https://download.freebsd.org/ftp/doc/

Questions that are not answered by the documentation may be sent to <freebsd-questions@FreeBSD.org>.
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