RHCSA Exam Study Guide with Complete Solutions
Repeat last command - Answer️️ -!!
Repeat last argument in current command - Answer️️ -!$
Kernel log message command - Answer️️ -dmesg
File usage - Answer️️ -du -hsx
h - human, s - summarize,
x - single fs
Umount a busy drive - A...
turn <cmd> on for important run levels - Answer✔️✔️-chkconfig <cmd> on
check what levels <cmd> is set to run at - Answer✔️✔️-chkconfig --list
<cmd>
cmd to set instructions for crond - Answer✔️✔️-crontab -e
script comment symbol - Answer✔️✔️-#
crontab format - Answer✔️✔️-min hr date month day command
what day number is Sunday - Answer✔️✔️-zero
cmd to get crontab help - Answer✔️✔️-man 5 crontab
cmd to view email - Answer✔️✔️-mail
where are emails stored - Answer✔️✔️-/var/spool/mail
show list of crond tasks - Answer✔️✔️-crontab -l
be careful of this when creating crond tasks - Answer✔️✔️-the created task
will run as the user you are logged in as
cmd for disk usage - Answer✔️✔️-du -hsx
h - human, s - summarize, x - single fs
cmd to find all open instances of cdrom - Answer✔️✔️-lsof +D /dev/cdrom
list open files, +D is for all instances and included files
repeat previous argument - Answer✔️✔️-!$
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