alias lsold="ls -rtlh *(D.Om[1,10])" # display the oldest files
#a2# Display the ten smallest files
alias lssmall="ls -Srl *(.oL[1,10])" # display the smallest files
+#a2# Display the ten newest directories and ten newest .directories
+alias lsnewdir="ls -rthdl *(/om[1,10]) .*(D/om[1,10])"
+#a2# Display the ten oldest directories and ten oldest .directories
+alias lsolddir="ls -rthdl *(/Om[1,10]) .*(D/Om[1,10])"
# chmod
#a2# Execute \kbd{chmod 600}