echo always exits with a 0 status, and simply prints arguments followed by an end of line character on the standard output, while printf allows for definition of a formatting string and gives a non-zero exit status code upon failure. printf has more control over the output format.
What is the difference between the print and echo commands?
echo and print are more or less the same. They are both used to output data to the screen. The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters (although such usage is rare) while print can take one argument.
Should I use echo or printf?
The only reason to use echo rather than printf is that the forma can be simpler. If you know what you’re printing, echo foo is faster and easier to type than printf ‘foon’ . Apart from that, when writing scripts where a variable needs to be printed, there’s never a good reason to use echo .
What does printf mean in Linux?
“printf” command in Linux is used to display the given string, number or any other format specifier on the terminal window. … Note: printf can have format specifiers, escape sequences or ordinary characters.
Which statement is faster amoung echo and print?
Which statement is faster amoung echo and print? Explanation: Echo is faster than print.
Is echo faster than printf?
Probably, if you add the newline character that echo uses by default (except when using -n option) you’ll get the same effect. that is obviously slower than without printing the n , but yet faster than echo . At a very high level.. printf is like echo but more formatting can be done.
Is printf portable?
printf is more portable. It should always be preferred over echo -e .
What is echo $? In Unix?
In computing, echo is a command that outputs the strings it is being passed as arguments. It is a command available in various operating system shells and typically used in shell scripts and batch files to output status text to the screen or a computer file, or as a source part of a pipeline.
What does $$ do in Linux?
$$ is the id of the current process. Every process in a UNIX like operating system has a (temporarily) unique identifier, the PID. No two processes running at the same time can have the same PID, and $$ refers to the PID of the bash instance running the script.
How do I use printf?
We use printf() function with %d format specifier to display the value of an integer variable. Similarly %c is used to display character, %f for float variable, %s for string variable, %lf for double and %x for hexadecimal variable. To generate a newline,we use “n” in C printf() statement.
Can we use printf in Shell?
printf is a shell builtin in Bash and in other popular shells like Zsh and Ksh. There is also a standalone /usr/bin/printf binary, but the shell built-in version takes precedence. We will cover the Bash builtin version of printf . The -v option tells printf not to print the output but to assign it to the variable.