ls list
go pass/pass/pass/
ls – directory listing
ls -al – formatted listing with hidden files
cd dir - change directory to dir
cd – change to home
pwd – show current directory
mkdir dir – create a directory dir
rm file – delete file
rm -r dir – delete directory dir
rm -f file – force remove file
rm -rf dir – force remove directory dir *
cp file1 file2 – copy file1 to file2
cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it doesn't exist
du disk usage
du -h to read by GB or TB
du -a total
top
ps -A | grep firefox
pkill firefox
killall firefox
sleep 10;import -window root hoge.jpg capture screen shot 10 seconds later
ln -s /folder /shortcutlocation