1. Command to list the files in a directory?
ls - list directory contents
ls -l (-l use a long listing format)
2. Command to list all the files in a directory, including the hidden files?
ls -a (-a, do not hide entries starting with .)
3. Command to find out all processes that are currently running?
ps -f (-f does full-format listing.)
4. Command to find out the processes that are currently running or a particular user?
ps -au Myname (-u by effective user ID (supports names)) (a - all users)
5. Command to kill a particular process?
kill -9 23456 (process_id 23456) or kill -9 %8765 (job number 8765)
kill -9 -1 (Kill all processes you can kill.)
killall - kill processes by name most (useful - killall java)
6. Commands to view the contents of the file?
less filename
cat filename
more filename
tail filename - can see the end of the file.
head filename - can see the head of the file
vi filename
vim filename
7. Commands to use edit contents of the file?
vi filename
vim filename
nano filename
view filename
visudo — edit the sudoers file
8. Command to view contents of a large log file?
tailf /var/log/messages ( last 10 rows)
less filename
head /var/log/messages (first 10 rows)
9. How do you log in to a remote Unix box?
ssh remote_server — OpenSSH SSH client (remote login program)
10.How do you get help on a UNIX terminal?
man command_name
info command_name (more information)
11.Command to list contents of a directory including all of its
subdirectories, providing full details and sorted by modification time?
ls -acl filename
-a all entries
-c by time
-l use a long listing format
12.How do you create a symbolic link to a file (give some reasons of doing so)?
ln - make links between files
Links create pointers to the actual files, without duplicating the contents of
the files. That is, a link is a way of providing another name to the same file.
There are two types of links to a file.
a.Hard link
b.Symbolic (or soft) link
13. What is a filesystem?
Sum of all directories called file system.
A file system is the primary means of file storage in UNIX.
File systems are made of inodes and superblocks.
14. Command to get file system usage?
df - report file system disk space usage.
15. How do you check the sizes of all users home directories (one command)?
du -sh /home/
du command summarize disk usage of each FILE, recursively for directories..
ls - list directory contents
ls -l (-l use a long listing format)
2. Command to list all the files in a directory, including the hidden files?
ls -a (-a, do not hide entries starting with .)
3. Command to find out all processes that are currently running?
ps -f (-f does full-format listing.)
4. Command to find out the processes that are currently running or a particular user?
ps -au Myname (-u by effective user ID (supports names)) (a - all users)
5. Command to kill a particular process?
kill -9 23456 (process_id 23456) or kill -9 %8765 (job number 8765)
kill -9 -1 (Kill all processes you can kill.)
killall - kill processes by name most (useful - killall java)
6. Commands to view the contents of the file?
less filename
cat filename
more filename
tail filename - can see the end of the file.
head filename - can see the head of the file
vi filename
vim filename
7. Commands to use edit contents of the file?
vi filename
vim filename
nano filename
view filename
visudo — edit the sudoers file
8. Command to view contents of a large log file?
tailf /var/log/messages ( last 10 rows)
less filename
head /var/log/messages (first 10 rows)
9. How do you log in to a remote Unix box?
ssh remote_server — OpenSSH SSH client (remote login program)
10.How do you get help on a UNIX terminal?
man command_name
info command_name (more information)
11.Command to list contents of a directory including all of its
subdirectories, providing full details and sorted by modification time?
ls -acl filename
-a all entries
-c by time
-l use a long listing format
12.How do you create a symbolic link to a file (give some reasons of doing so)?
ln - make links between files
Links create pointers to the actual files, without duplicating the contents of
the files. That is, a link is a way of providing another name to the same file.
There are two types of links to a file.
a.Hard link
b.Symbolic (or soft) link
13. What is a filesystem?
Sum of all directories called file system.
A file system is the primary means of file storage in UNIX.
File systems are made of inodes and superblocks.
14. Command to get file system usage?
df - report file system disk space usage.
15. How do you check the sizes of all users home directories (one command)?
du -sh /home/
du command summarize disk usage of each FILE, recursively for directories..
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