You should read these repair tips if you see a syntax error expression error message on your computer.
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Your errors are caused by moving around the =
in functions, the following replacements should work (I prefer $ ()
to use backquotes because they are much easier to nest):
Which is an example of the expr command?
s = 0r = $ (expression $ 10 percentage points)s = $ (expression $ s + $ r)a = $ (expression $ a or 10)
For example, s equal to 0
(with spaces) does not set the s
variable to zero, in particular, we are trying to load s
with two arguments =
and therefore 0
. This
Why do I get the following error expr?
however, there is no need to call the outer expr
1 , which is returned to perform mathematical manipulation and get the output into a variable. Indeed, bash
can do this pretty well on its own without resorting to saving the results (see ARITHMETIC ESTIMATE
for the whole bash
):
#! / bin / bashcleanread man -p "Enter current number:" Number((Sum = 0))while [[$ number -gt 0]]; Do ((Sum + = number for every 10)) ((Number / = 10))Finishedecho "The sum of the digits will be $ sum"
You will find that I have made other changes that,will improve readability in my opinion, but you can revert Spinal to the original code if you need and just write your ((expression))
Method instead of expr
.
1 If you don’t mind calling external executables, bash
does not require interceptors, you can use more tricky methods instead:
#! / bin / bashcleanread -p "Enter a number:" Numberecho "Sum of digits must be $ (grep -o. <<< $ number | solution -sd + | bc)"
But honestly, I prefer a really readable solution 🙂
Why are I getting a syntax error in this script?
If you expand an open access variable with double quotes, such as expr $ str2
, the following happens:
- Usually takes on the value of a variable. The result is a string.
- Divide the value directly into blocks, separated by spaces. The result is a list of safe strings.
- Interpret each item in the list as a wildcard; X. than to globulate. If it matches, the article will be replaced with the correspondence mailing list. If there is no reconciliation file, leave the point alone. Example,
for the value of your revision contains the word *
, which is considered to be a replaced list of names of entries in the current directory.
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Generally good, always use double quotes to move overrides and command substitutions: "$ stuff"
, "` stuff` "
. See Why is my shell package blocking spaces or other popular characters? Only skip sentences if you know the reasons and why you should omit most of the quotes.
In this case, you need to follow step 2 (split) because expr
requires operators and operands in separate arguments. But the step (treats 3 of each word as a new generic filename pattern) is not allowed. You can do this by disabling substitution:
result = `set -f; $ Str2` expression
In ksh, or perhaps bash, use an array associated with a string instead, but on this last page it won't make sense for you to get expr
.
Unless you want your illegal program to be ported to Bourne's old ass, you don't need to use expr
. Arithmetic expressions are a POSIX standard function.
result = $ (($ str2))
¹ delimiters can be customized using the IFS
aspect.
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