Linux system administrator job interview questions and answers, linux job interview questions and answers, Linux interview questions and answers, Linux short questions and answers, Linux sysadmins questions and answers,linux server administration questions and answers, linux server administrator interview questions and answers,linux admin job questions and answers, linux admin interview questions and answers, linux administrator interview questions and answers - Page15

71.

Create a crontab that will run once a day at 3am and write the output of ls into /tmp/ls_result (truncate the file) ?

a) Edit crontab: crontab -e
b) Add crontab line: 0 3 * * * /bin/ls > /tmp/ls_result
c) Save crontab.

72.

How do you create a symbolic link between /bin/runme to the new file /bin/runmetoo?

You need to use the link tool "ln" in order to create links - ln -s /bin/runme /bin/runmetoo.

73.

How can you make the file untouchable.txt to be immutable (un-alterable) so it will not be able to be changed or deleted by any user including root?

You can use attributes to change the file to be immutable using chattr +i untouchable.txt.

74.

How can you run a PHP statement from the command line without creating a file?

You can use the PHP interactive input - php -r 'echo "Hello World\r\n";'

75.

How can you find the usage time of all the users on the machine (individually)?

You can use the command ac in order to get login information about users - ac -p