Learning Fedora Linux

Saturday, November 08, 2008

Sticky bit: when viewing the details of a directory file permissions will can start out with several values. If it starts with a "t" that is a sticky bit. This means only the user that created it can delete or alter it.
setuid: when a directories detail startes with "s". This file is ran as if the user created it has run it, even if another user is trying to execute.
find: less than ideal way of searching the file system
locate: searches a database of files on the file system
updatedb: updates locate database
whereis: lets you search for where programs are stored
du: disk usage shows how big files are on disk
du -sh: shows total of current directory
df: shows total disk size
less: shows contents of a file. "/" lets you search down and ? lets you search up.
head: shows beggining of file
head -n5 myfile: shows 5 of the first lines of a file
grep -r 'searchtext' *: searches every file in the directory for the 'searchtext'
grep -i: ignores case on search
top: shows system processes
top d: typing d lets you change the refresh rate
top r: lets you renice or set a lower priority on a process
pstree: lets you see a hierarchal tree of owned processes
xorg: controls graphical system for linux

ls parameters:
h: shows sizes in kilo, mega and gigabytes
S: shows sizes in order size

keyboard shortcuts:
ctrl+a: move to beginning of line
ctrl+e: move to end of line
ctrl+u: delete whole line
ctrl+k: delete from cursor to end of line
ctrl+w: delete from cursor to beginning of word
alt+d: delete from cursor to end of word
ctrl+l: clear screen
ctrl+_: undo all changes since last command
alt+r: undo change made to line
alt+l: lower case current word

ls > outputfile.txt: writes results of command to a file
ls >> outputfile.txt: add results to existing file
sort < joenames.txt > joesorted.txt: writes file into command and then back out to another file after sorting.