Linux OS Shell Interview Question:

What is the output of this program?

#!/bin/bash
san_var="google"
echo "$san_var"
echo '$san_var'
echo '"$san_var"'
echo "'$san_var'"
echo $san_var
exit 0
a) google
$san_var
"$san_var"
'google'
$san_var
b) google
google
"google"
'google'
google
c) program will generate an error message
d) program will print nothing

Submitted by: Murtaza

a) google
$san_var
"$san_var"
'google'
$san_var

Explanation:
Using double quotes does not affect the substitution of the variable, while single quotes and backslash do.
Output:
root@ubuntu:/home/google# ./test.sh
google
$san_var
"$san_var"
'google'
$san_var
root@ubuntu:/home/google#
Submitted by: Murtaza

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Linux OS Shell Interview Question:

Top Linux OS Shell Questions

cmd > abc 2>&1 will:
a) Write file2 to file1
b) Write standard output and standard error to abc
c) Write standard error to abc
d) Write standard output to abc & standard error to monitor

The redirection 2> abc implies:
a) Write file 2 to file abc
b) Write standard output to abc
c) Write standard error to abc
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Which of these is the correct method for appending \"foo\" in /tmp/bar file?
a) echo foo > /tmp/bar
b) echo foo >> /tmp/bar
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a) _san
b) san_2
c) _san_2
d) 2_san

What will be output of following command:
$ echo \"The process id is\" $$$$

a) The process id is $$
b) The process id is $<pid>$<pid>
c) The process id is <pid><pid>
d) The process id is $$$$

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