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Unix Commands Interview Questions & Answers - Learning Mode

Unix Commands Interview Questions & Answers - Learning Mode

There are thousands of commands available on a typical unix box. In bash, just hit the "Tab" key twice and say yes, to display the the commands currently available on your machine. A standard unix operating system lists currently thousands of commands. Type x to list all commands starting with x.

Try Unix Commands Interview Questions & Answers - Exam Mode

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Unix Commands Interview Questions & Answers - Learning Mode
Try Unix Commands Interview Questions & Answers - Exam Mode
Question: Using the commands ps, cut, tr and kill, along with pipes, write a command that will find all sleep processes running on the system and kill them?

Answer: ps: check process status
Syntax: ps ?option
e: list all currently running processes (A for Linux)
f: gives full listing (give ancestry for Linux)
l: gives long listing
u username: list processes for the user only
S: sleeping
O: running
R: on run queue
Z: zombie (parent didn?t wait for death of its child
T: stopped or suspended

Question: Which command is used to delete all files in the current directory and all its sub-directories?

Answer: rm -r * Source:
Question: Difference Between Grep and Find command ?

Answer: Find command is used to search for a file with a specific file name in a set of files.
Syntax: find .-name "fileE" -print

grep command is used to search pattren within a file.
Syntax: grep "pattren" filename Source:
Question: What is the difference between cat and more command?

Answer: Cat displays file contents. If the file is large the contents scroll off the screen before we view it. So command 'more' is like a pager which displays the contents page by page. Source:
Question: Is it possible to count number char, line in a file; if so, How?

Answer: Yes, wc-stands for word count.
wc -c for counting number of characters in a file.
wc -l for counting lines in a file. Source:
Question: What is the significance of the ?tee? command?

Answer: It reads the standard input and sends it to the standard output while redirecting a copy of what it has read to the file specified by the user. Source:
Question: What difference between cmp and diff commands?

Answer: cmp - Compares two files byte by byte and displays the first mismatch
diff - tells the changes to be made to make the files identical Source:
Question: Explain the steps that a shell follows while processing a command.

Answer: After the command line is terminated by the key, the shel goes ahead with processing the command line in one or more passes. The sequence is well defined and assumes the following order.
Parsing: The shell first breaks up the command line into words, using spaces and the delimiters, unless quoted. All consecutive occurrences of a space or tab are replaced here with a single space.
Variable evaluation: All words preceded by a $ are avaluated as variables, unless quoted or escaped.
Comman Source:
Question: 1)what are all Unix commands we are using in informatica?

Answer: No answer available currently.
Question: Brief about finger username?

Answer: This command is used to give information about the user; it gives out a profile about the user. This command is very useful for administrators as it gives the log information, email, current log information, etc. finger also displays information such as phone number and name when they use a file called .plan. Source:
Question: What does the command ? $who | sort ?logfile > newfile? do?

Answer: The input from a pipe can be combined with the input from a file . The trick is to use the special symbol ?-? (a hyphen) for those commands that recognize the hyphen as std input.
In the above command the output from who becomes the std input to sort , meanwhile sort opens the file logfile, the contents of this file is sorted together with the output of who (rep by the hyphen) and the sorted output is redirected to the file newfile. Source:
Question: What is a pipe and give an example?

Answer: A pipe is two or more commands separated by pipe char '|'. That tells the shell to arrange for the output of the preceding command to be passed as input to the following
Example : ls -l | pr
The output for a command ls is the standard input of pr.
When a sequence of commands are combined using pipe, then it is called pipeline. Source:
Question: Explain about system and user utilities?

Answer: There are two utilities they are system and user utilities. System utilities contain administrative tools such as mkfs, fsck, etc. Where as user utilities contain features such as passwd, kill, etc. It basically contains environment values. Source:
Question: Explain about document formatting?

Answer: UNIX systems were primarily used for typesetting systems and document formatting. Modern UNIX systems used packages such as Tex and Ghostscript. It uses some of the programs such as nroff, tbl, troff, refer, eqn and pic. Document formatting is very used because it forms the base of UNIX. Source:
Question: Brief about the command ff?

Answer: This command finds files present anywhere on the system. This command is used to find document location where you forgot the directory in which you kept the file but you do remember about the name. This command is not restricted in finding files it displays files and documents relevant to the name. Source:
Question: Brief about the command kill PID?

Answer: This command ends the process to which it was assigned (ID). This command cannot be used in multi systems in the network. ID can be obtained by the command ps. This command ignores completely the state at which the process is it kills the process. Source:
Question: Brief about the command nn?

Answer: This command allows you to read the news. First you can read about the local news and then the remote news. "nnl? command makes or allows you to read local news and nnr command is used to read remote news. Manual and help information is available with many popular packages. Source:
Question: Brief about ftp hostname?

Answer: This command lets you download information, documents, etc from a remote ftp. First it is important to configure an FTP for the process to begin. Some of the important commands relevant to the usage of FTP are as follows get, put, mget, mput, etc. If you are planning to transfer files other than ASCII defined it is imperative to use binary mode. Source:
Question: What does the command ?$ls | wc ?l > file1? do?

Answer: ls becomes the input to wc which counts the number of lines it receives as input and instead of displaying this count , the value is stored in file1. Source:
Question: How is the command ?$cat file2 ? different from ?$cat >file2 and >> redirection operators ?

Answer: is the output redirection operator when used it overwrites while >> operator appends into the file. Source:

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