1⟩ What are PIDs?
They are process IDs given to processes. A PID can vary from 0 to 65535.
Shell Scripting
Home Operating System Shell Scripting
“Shell Scripting Interview Questions and Answers will guide us now that a shell script is a script written for the shell, or command line interpreter, of an operating system. It is often considered a simple domain-specific programming language. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. Learn Shell Scripting with this Shell Scripting Interview Questions with Answers guide”
30 Shell Scripting Questions And Answers
2⟩ How do you remove a file?
rm
3⟩ How do you send a mail message to somebody?
mail somebody@rendc.org -s ‘Your subject’ -c ‘ cc@rendc.org‘
4⟩ How do you remove recursively?
rm -rf
5⟩ How do you find out your own username?
whoami
6⟩ How do you count words, lines and characters in a file?
wc
7⟩ How do you search for a string inside a given file?
grep string filename
8⟩ How do you search for a string inside a directory?
grep string *
9⟩ How do you search for a string in a directory with the subdirectories recursed?
grep -r string *
10⟩ How do you list currently running process?
ps
11⟩ How do you find out what’s your shell?
echo $SHELL
12⟩ How do you fire a process in the background?
./process-name &
13⟩ How do you refer to the arguments passed to a shell script?
, and so on. {xtypo_info}$1, $2 and so on. $0 is your script name.{/xtypo_info} is your script name.
14⟩ What’s the conditional statement in shell scripting?
if {condition} then … fi
15⟩ How do you do number comparison in shell scripts?
-eq, -ne, -lt, -le, -gt, -ge
16⟩ How do you test for file properties in shell scripts?
-s filename tells you if the file is not empty, -f filename tells you whether the argument is a file, and not a directory, -d filename tests if the argument is a directory, and not a file, -w filename tests for writeability, -r filename tests for readability, -x filename tests for executability
17⟩ How do you do Boolean logic operators in shell scripting?
! tests for logical not, -a tests for logical and, and -o tests for logical or.
18⟩ How do you find out the number of arguments passed to the shell script?
$#
19⟩ What’s a way to do multilevel if-else’s in shell scripting?
if {condition} then {statement} elif {condition} {statement} fi
20⟩ How do you write a for loop in shell?
for {variable name} in {list} do {statement} done
