Feb 17, 2016 · What is echo $? in linux terminal? [duplicate] Asked 9 years, 10 months ago Modified 9 years, 10 months ago Viewed 53k times

20 I have copied a Bash script that extracts values from an XML file. I can 'echo' the result of a calculation perfectly, but assigning this to a variable doesn't seem to work.

Aug 1, 2019 · What does echo $? mean in shell programming?true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status …

Note: This is not portable among various implementations of echo builtin/external executable. The portable way would be to use printf instead:

echo "El numero de lineas es $(cat nombrefichero | wc -l)" En este caso, si utilizases solo wc -l nombrefichero te mostraría en la salida el el numero de líneas y el nombre del fichero. Para evitar …

May 7, 2017 · What output did you expect from echo < file.txt? Input redirection works just fine, it's just that echo doesn't try to read anything from stdin.

I often come across $?, $0, $1, $2, etc in shell scripting. I know that $? returns the exit status of the last command: echo &quot;this will return 0&quot; echo $? But what do the others do? What ...

Dec 11, 2011 · Is it possible with bash to execute a command from shell and if it returns a certain value (or an empty one) execute a command? if [ "echo test" == "test"]; then echo "echo test outputs test …

When I run the following Bash script, I would expect it to print Hello. Instead, it prints a blank line and exits. echo 'Hello' | echo Why doesn't piping output from echo to echo work?

Mar 4, 2015 · I want to echo two variables on the same line. I want to store 2015-03-04.01.Abhi_Ram.txt in a variable FILENAME and 10 in a variable COUNT and echo them simultaneously.