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Bash expr with Examples - LinuxOPsys How to use bash expr In this section, we will understand the use of expr command to perform arithmetic, comparison, and logical operations We will explore how expr can be used with strings and even regular expressions We also dive in to learn about command substitution using backticks (`) and how expr acts on variables 1 Basic arithmetic
bash - Using expr, $ ( ()), ( ()) - Unix Linux Stack Exchange expr is old, but it does have one limited use I can think of Say you want to search a string If you want to stay POSIX with grep, you need to use a pipe: if echo november | grep nov then : do something fi expr can do this without a pipe: if expr november : nov then : do something fi the only catch is expr works with anchored strings, so if you want to match after the beginning you need to
Adding two numbers using expr - Unix Linux Stack Exchange I'm learning Shell scripting for a diploma in IT I'm currently doing I'm trying to write a small script that adds two numbers as shown as in one of the tutorials we were given echo "Enter two nu
Bash Division Explained - LinuxOPsys We can directly wrap the expression inside expr to perform division Furthermore, the result of division, performed using expr, is an integer Similar to the expr command, the numerator and the denominator cannot be floating point numbers Spaces are required before and after the division operator If not provided, the expression supplied to the expr command is processed as a string, giving a
What is expr doing when processing arrays? - Unix Linux Stack Exchange 1 Expr is a command line tool, it is independent from the bash It does not know anything about arrays It gets command line arguments, exactly those what we refer as $1, $2, $3 etc in our scripts Important thing is: bash knows arrays, but as you call a binary, it can only get a list of arguments as its parameters
Why should I use $ [ EXPR ] instead of $ ( ( EXPR ))? to be quite honest, I am not sure this answers the question Basically the linked bash documentation says exactly the opposite: use $(()) instead of $[] giving the reason of the former being deprecated So I still don’t know why my link recommended using the latter, and I am unsure which documentation is more trustworthy
Substring extraction with expr - Unix Linux Stack Exchange Why did't the 'expr' give result for the second substring search It can be seen that 'ab' had been prefixed to the substring in the third search that is the only difference between 2nd and 3rd search
bash - Why isnt this `expr . . . | bc -l` command working? - Unix . . . expr is a command that can also perform (basic integer) arithmetic, but then it's pointless to pipe its output to bc -l which also does mathematics Choose one or the other, not both Using echo sends the expression to the standard input of bc -l which then evaluates the expression
shell - How to do integer float calculations, in bash or other . . . Using echo "20+5" literally produces the text " 20+5 " What command can I use to get the numeric sum, 25 in this case? Also, what's the easiest way to do it just using bash for floating point? For example, echo $((3224 3807 0)) prints 0 : ( I am looking for answers using either the basic command shell ('command line') itself or through using languages that are available from the command line