Linux commands

who am i
who
w - extended who command
who -b
fuser /dev/ttyS0
ps proc_id
fuser -k /dev/ttyS0
vmstat - virtual memory status
find
file
wc - count lines,words,characters in a file
df - filesystem statistics
netstat
iostat
diff
sdiff
lshalb  - dynamic database of connected hardware devices

RENAME exe to exe1
find . -name "*.exe" | while read i;
  do
	mv "$i" "${i%.exe}.exe1";
  done