Unix - Interview Questions and Answers for 'Unix commands' - 8 question(s) found - Order By Newest Q1. How to display and set the Class path in Unix ?
Ans. To display the current CLASSPATH variable, use these commands in UNIX (Bourne shell): % echo $CLASSPATH To delete the current contents of the CLASSPATH variable, In UNIX: % unset CLASSPATH; export CLASSPATH To set the CLASSPATH variable, In UNIX: % CLASSPATH=/home/george/java/classes; export CLASSPATH Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix   unix commands   classpath Q2. What is the use of !! command ? Can I use it with conjunction to some other string to complete a command ? Unix
Ans. Its used to execute last command. Yes this can be used with other string to execute new command. For eg - if ls was the last command, We can execute !! -l for having the long listing. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix   unix commands   !! unix command   build management   release management Q3. Write a unix command to find top 10 files by size ? Unix
Ans. du -a /var | sort -n -r | head -n 10 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix command Asked in 1 Companies Q4. What are fields that gets displayed when you execute "Top" command and briefly explain each field ? Unix
Ans. PID - process identification number is an identification number that is automatically assigned to each process when it is created
USER - User Name
PR - PR is the process actual priority
NI is the nice value, which is a user-space concept.
VIRT -Virtual Image (kb). The total amount of virtual memory used by the task.
RES - Resident size (kb). The non-swapped physical memory a task has used.
SHR - Shared Mem size (kb). The amount of shared memory used by a task.
S - Process Status. The status of the task which can be one of:
D = uninterruptible sleep
R = running
S = sleeping
T = traced or stopped
Z = zombie
%CPU - % CPU usage
%MEM - % MEM Usage
TIME - Total CPU time the task has used since it started.
COMMAND - Command which was used to execute the process Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  top command  unix command Asked in 1 Companies Q5. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it. Unix
Ans. chmod 477 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix commands  setting file permissions  chown  chmod Q6. Can you tell me any 10 unix command you have worked with ? Unix
Ans. grep, ls, kill, vi , scp , wget,telnet, zip, unzip,mv,cp Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix commands Asked in 1 Companies basic Q7. How do you ftp files to a different server ? Do you use scp or mput etc. Unix
Ans. I use both mput as well as scp. mput usually with sftp Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  unix commands  ftp Q8. Can we change permissions recursively for all folders and files within a single folder ? Unix
Ans. chmod 777 -R /directory Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  Unix Commands Q9. How to append the output of a command to file Unix
a. command < file b. command > file c. command <> file d. command >> fileAns.d. command >> file
Q10. Which command helps you know in which folder you currently are ? Unix
a. cat b. pwd c. vi d. who am iAns.b. pwd