A user is asking the systems administrator for assistance with writing a script to verify whether a file exists. Given the following: Which of the following commands should replace the <CONDITIONAL>…

The correct answer is A. if [ -f "$filename" ]; then. The command if [ -f "$filename" ]; then checks if the variable $filename refers to a regular file that exists. The -f option is used to test for files. If the condition is true, the commands after then are executed. This is the correct way to replace the <CONDITIONAL> string…

Scripting, Containers, and Automation

Question

A user is asking the systems administrator for assistance with writing a script to verify whether a file exists. Given the following:

Which of the following commands should replace the <CONDITIONAL> string?

Options

Aif [ -f "$filename" ]; then
Bif [ -d "$filename" ]; then
Cif [ -f "$filename" ] then
Dif [ -f "$filename" ]; while

How the community answered

(65 responses)

A
94% (61)
B
2% (1)
C
2% (1)
D
3% (2)

Explanation

The command if [ -f "$filename" ]; then checks if the variable $filename refers to a regular file that exists. The -f option is used to test for files. If the condition is true, the commands after then are executed. This is the correct way to replace the <CONDITIONAL> string. The other options are incorrect because they either use the wrong option (-d tests for directories), the wrong syntax (missing a semicolon after the condition), or the wrong keyword (while is used for loops, not

Topics

#Bash scripting#Conditional statements#File system checks#Scripting syntax

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