backticks

I am trying to make a Bash script where the user will be able to copy a file, and see if it was successfully done or not. But every time the copy is done, properly or not, the second output "copy was not done" is shown. Any idea how to solve this? if [ `cp -i $files $destination` ];then echo "Copy successful." else echo "Copy was not done" fi PSkocik What you want is if cp -i "$file" "$destination"; then #... Don't forget the quotes. You version: if [ `cp -i $files $destination` ];then #.. will always execute the else branch. The if statement in the shell takes a command. If that command

Perl supports three ways (that I know of) of running external programs: system : system PROGRAM LIST as in: system "abc"; backticks as in: `abc`; running it through a pipe as in: open ABC, "abc|"; What are the differences between them? Here's what I know: You can use backticks and pipes to get the output of the command easily. that's it (more in future edits?) system(): runs command and returns command's exit status backticks: runs command and returns the command's output pipes : runs command and allows you to use them as an handle Also backticks redirects the executed program's STDOUT to a

What are the backticks used for in the snippet below? Why add them around the fun is(amount:Int ):Boolean { ... } ? verifier.`is`(amount) It's because is is a reserved keyword in Kotlin. Since Kotlin is supposed to be interoperable with Java and is is a valid method (identifier) name in Java, the backticks are used to escape the method so that it can be used as a method without confusing it as a keyword. Without it it will not work because it would be invalid syntax. This is highlighted in the Kotlin documentation : Escaping for Java identifiers that are keywords in Kotlin Some of the Kotlin

I'm trying to understand what backticks do in R. From what I can tell, this is not explained in the ?Quotes documentation page for R. For example, at the R console: "[[" # [1] "[[" `[[` # .Primitive("[[") It seem to be returning the equivalent to: get("[[") jaimedash A pair of backticks is a way to refer to names or combinations of symbols that are otherwise reserved or illegal. Reserved are words like if are part of the language, while illegal includes non-syntactic combinations like c a t . These two categories, reserved and illegal, are referred to in R documentation as non-syntactic names

What is the equivalent of the backticks found in Ruby and Perl in Python? That is, in Ruby I can do this: foo = `cat /tmp/baz` What does the equivalent statement look like in Python? I've tried os.system("cat /tmp/baz") but that puts the result to standard out and returns to me the error code of that operation. output = os.popen('cat /tmp/baz').read() The most flexible way is to use the subprocess module: import subprocess out = subprocess.run(["cat", "/tmp/baz"], capture_output=True) print("program output:", out) capture_output was introduced in Python 3.7, for older versions the special

When working with Bash, I can put the output of one command into another command like so: my_command `echo Test` would be the same thing as my_command Test (Obviously, this is just a non-practical example.) I'm just wondering if you can do the same thing in Batch. zvrba You can do it by redirecting the output to a file first. For example: echo zz > bla.txt set /p VV=<bla.txt echo %VV% You can get a similar functionality using cmd.exe scripts with the for /f command: for /f "usebackq tokens=*" %%a in (`echo Test`) do my_command %%a Yeah, it's kinda non-obvious (to say the least), but it's what