What is the difference between echo and print in shell script?
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.
Is printf better than echo?
While printf is better for many reasons, most people still use echo because the syntax is simpler. The main reasons why you should prefer printf are: echo is not standardized, it will behave differently on different systems.
What does echo do in bash?
The echo command is used to display a line of text that is passed in as an argument. This is a bash command that is mostly used in shell scripts to output status to the screen or to a file.
Is echo faster than printf statement?
VLD is written by Derrick Rethans and as you can read on the VLD homepage, it “hooks into the Zend Engine and dumps all the opcodes (execution units) of a script”. Yes, print uses one more opcode because it actually returns something. We can conclude that echo is faster than print .
What is the difference between print and printf?
The difference between printf and print is the format argument. This is an expression whose value is taken as a string; it specifies how to output each of the other arguments. The printf statement does not automatically append a newline to its output. It outputs only what the format string specifies.
Is echo a print command?
The echo command will print them literally by default. If we pass the -e option to the echo command, it will interpret the following backslash-escaped characters: \\ – displays a backslash character.
Is printf Posix compliant?
The POSIX specification actually does tell us to use printf instead in that case. So what that means is that you can’t use echo to display uncontrolled data.
Is printf portable?
I believe printf is technically still more portable because the default xpg_echo behavior can vary between platforms even within Bash (so you can set it explicitly if you really wanted.)
What is echo option?
The echo command is one of the most commonly and widely used built-in commands for Linux bash and C shells, that typically used in a scripting language and batch files to display a line of text/string on standard output or a file. echo command examples. The syntax for the echo command is: echo [option(s)] [string(s)] 1 …
What does echo mean?
echo $? will return the exit status of last command. You got 127 that is the exit status of last executed command exited with some error (most probably). Commands on successful completion exit with an exit status of 0 (most probably).
What is the difference between printf and sprintf )?
The printf function formats and writes output to the standard output stream, stdout . The sprintf function formats and stores a series of characters and values in the array pointed to by buffer.
What does printf stand for?
print formatted
“printf” is the name of one of the main C output functions, and stands for “print formatted”. printf format strings are complementary to scanf format strings, which provide formatted input (parsing).
What is the difference between Echo and printf in Linux?
Both echo and printf are built-in commands (printf is Bash built-in since v2.0.2 (1998)). 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.
What is the difference between Echo Blah and printf Blah?
The onlydifference between echo “blah”and printf “blah”is echowill output an extra newline. Does that matter to the server? Does the order when receiving several commands in a row matter?
What are some examples of Bash printf command?
Let me show you some examples of Bash printf command. Let’s start with the syntax first. Here, format is a string that determines how the subsequent values will be displayed. In the example printf “My brother \%s is \%d years old. ” Prakash 21, the entire “My brother \%s is \%d years old. ” is format and it is followed by the arguments Prakash and 21.
How to print in Linux command line?
The simplest way to print in Linux command line is by using echo command. echo “Value of var is $var” However, echo command won’t be adequate when you need to print formatted output. This is where printf command helps you. The bash printf command operates like the printf command in C/ C++ programming language.