主贴直达：https://testerhome.com/topics/11333
- (1).tee
- (2).awk
- (3).tr
- (4).cut
- (5).tac
- (6).curl
- (7).wget
- (8).watch
- (9).head
- (10).tail
- (11).What does an & after a command do?
- (12).What does & disown after a command do?
- (13).What is a packet filter and how does it work?
- (14).What is Virtual Memory?
- (15).What is swap and what is it used for?
- (16).What is an A record, an NS record, a PTR record, a CNAME record, an MX record?
- (17).Are there any other RRs and what are they used for?
- (18).What is a Split-Horizon DNS?
- (19).What is the sticky bit?
- (20).What does the immutable bit do to a file?
- (21).What is the difference between hardlinks and symlinks? What happens when you remove the source to a symlink/hardlink?
- (22).What is an inode and what fields are stored in an inode?
- (23).How to force/trigger a file system check on next reboot?
- (24).What is SNMP and what is it used for?
- (25).What is a runlevel and how to get the current runlevel?
- (26).What is SSH port forwarding?
- (27).What is the difference between local and remote port forwarding?
- (28).What are the steps to add a user to a system without using useradd/adduser?
- (29).What is MAJOR and MINOR numbers of special files?
- (30).Describe the mknod command and when you'd use it.
- (32).Describe a scenario when you get a "filesystem is full" error, but 'df' shows there is free space.
- (33).Describe a scenario when deleting a file, but 'df' not showing the space being freed.
- (34).Describe how 'ps' works.
- (35).What happens to a child process that dies and has no parent process to wait for it and what’s bad about this?
- (36).Explain briefly each one of the process states.
- (37).How to know which process listens on a specific port?
- (38).What is a zombie process and what could be the cause of it?
- (39).You run a bash script and you want to see its output on your terminal and save it to a file at the same time. How could you do it?
- (40).Explain what echo "1" > /proc/sys/net/ipv4/ip_forward does.
- (41).Describe briefly the steps you need to take in order to create and install a valid certificate for the site https://foo.example.com.
- (42).Can you have several HTTPS virtual hosts sharing the same IP?
- (43).What is a wildcard certificate?
- (44).Which Linux file types do you know?
- (45).What is the difference between a process and a thread? And parent and child processes after a fork system call?
- (46).What is the difference between exec and fork?
- (47).What is "nohup" used for?
- (48).What is the difference between these two commands?
- (49).How many NTP servers would you configure in your local ntp.conf?
- (50).What does the column 'reach' mean in ntpq -p output?
- (51).You need to upgrade kernel at 100-1000 servers, how you would do this?
- (52).How can you get Host, Channel, ID, LUN of SCSI disk?
- (53).How can you limit process memory usage?
- (54).What is bash quick substitution/caret replace(xy)?
- (55).Do you know of any alternative shells? If so, have you used any?
- (56).What is a tarpipe (or, how would you go about copying everything, including hardlinks and special files, from one server to another)?
- (57).How can you tell if the httpd package was already installed?
- (58).How can you list the contents of a package?
- (59).How can you determine which package is better: openssh-server-5.3p1-118.1.el6_8.x86_64 or openssh-server-6.6p1-1.el6.x86_64 ?
- (60).Can you explain to me the difference between block based, and object based storage?
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