cd /opt/081024_morning/ 987 ll 988 cd /opt/081024_morning/dima2024 989 touch test.txt 990 chmod u+x,o-r test.txt 991 l 992 ls 993 ll 994 cd /opt/081024_morning/dima2024 995 ps -ef 996* 997 ps -ef | wc -l 998 ps -ef | tail -n+2 999 ps -ef | tail -n+2 | wc -l 1000 ps -ef 1001 ps -ef | tail -n+2 | wc -l >> ps.txt 1002 history 1003 cat ps.txt 1004 history [ec2-user@ip-172-31-33-20 dima2024]$