echo "*** EXECUTABLE BINARY COMMANDS" date /bin/date pwd ls ls -al echo echo one two three echo one "two three" four echo "|" printenv echo "*** SHELL BUILTIN COMMANDS (cd, setenv, unsetenv)" cd /usr pwd cd bin pwd cd pwd setenv XXX 123 printenv unsetenv XXX printenv echo "*** PIPE" ls -al | grep drw ls -al|grep rwx ps -A | grep sshd | sed -e '1,10d' ps -A | grep sshd | wc -l setenv XXX 123 printenv | grep XXX echo "*** ERRONEOUS COMMANDS" echo 'one" echo one" echo "one' nosuchcommand cd nosuchdir setenv unsetenv cat .bashrc | | grep export echo "*** MULTIPLE REDIRECTION ERRORS" cat .ishrc > /tmp/no1 > /tmp/no2 grep "echo" < .ishrc < .ishrc cat .ishrc | grep "echo" < .ishrc cat .ishrc > /tmp/no | grep "echo"