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Bash Script Expr Syntax Error

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bash has a amazing arithmetic expansion share|improve this answer edited Apr 9 '15 at 17:51 answered Apr 9 '15 at 16:25 Helio 2,69031640 I have updated the new script. It appears your intent is to escape the * character so it is not treated specially by the shell before being subjected to arithmetic expansion. Why to call expr to handle integers? share|improve this answer answered Oct 31 '10 at 6:44 alex 3,16931623 getcombination() { tempres=1 a=expr \( $2 - $1 \) + 1 b=1 while [ a -le $2 -a http://gatoisland.com/syntax-error/bash-expr-syntax-error.php

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Expr Syntax Error In Shell Script

What are the canonical white spaces? User contributions on this site are licensed under the Creative Commons Attribution Share Alike 4.0 International License. I am using the bash shell.

In fact, over the years, multiple facilities have been added to Unix to support working with numbers. Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Specialised Support Ubuntu Servers, Cloud and Juju Server Platforms [ubuntu] [SOLVED] Browse other questions tagged shell-scripting or ask your own question. Shell Script Expr Example American English: are [ə] and [ʌ] different phonemes?

So what do you get by declaring a variable to be an integer? Expr Syntax Error Multiplication Why did companions have such high social standing? To check if the input is a positive integer (only unsigned digits) you can use this awesome bash regex: [[ "$number" =~ ^[0-9]+$ ]] that checks if $numbercontains only digits. Why are some programming languages Turing complete but lack some abilities of other languages?

Successful matches are stored in the BASH_REMATCH array. Expr Syntax Error In Unix Shell Script I dont get your logic: Once your are reading A (yes 1!) filename what is the point to go through all this strange calculation and no storing of $filename (???), I The question does not have to be directly related to Linux and any language is fair game. How to indicate you are going straight?

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Expr Syntax Error Multiplication

Browse other questions tagged bash expr or ask your own question. Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. Expr Syntax Error In Shell Script Ubuntu Logo, Ubuntu and Canonical Canonical Ltd. Unix Shell Script Expr Related 0Syntax error Using expr substr in bash script0unix expr: syntax error2Multiplication with expr in shell script0Error “expr: command not found” in bourne script-1bash expr syntax error when multiplying variable by

This form is more forgiving about spaces. $ ((e=5)) $ echo $e 5 $ (( e = e + 3 )) $ echo $e 8 $ (( e=e+4 )) # -- his comment is here As the files have a header record, the count is decreased by 1 to get the actual number of records. I'm pretty sure having double quotes around it in a script makes a difference, but that might just be to do with $variables within the "s. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. Shell Script Math Expr

How do I do it? Note, however, that this must be `, same as the opening backquote. Browse other questions tagged shell or ask your own question. this contact form Visit the following links: Site Howto | Site FAQ | Sitemap | Register Now If you have any problems with the registration process or your account login, please contact us.

Do COB LEDs usually need electrically insulating from the heatsink? Expr Index Syntax Error See test. Natural construction more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture

If you know you have gnu dc available the more concise a=`dc -e "$precision k $var1 $var2 * $var3 /p"` can be used.

Not the answer you're looking for? Is it possible to check for existence of member template just by identifier? But inside a $(( )) construct, one does not escape *. Expr Syntax Error Bash This is not merely a matter of idle curiosity--understanding that helps you comprehend this and other error messages in the future.

As you can see, it is picky about spaces. $ z=5 $ z=`expr $z+1` ---- Need spaces around + sign. $ echo $z 5+1 $ z=`expr $z + 1` $ echo Find More Posts by baosheng 06-06-2005, 02:55 AM #2 slackie1000 Senior Member Registered: Dec 2003 Location: Brasil Distribution: Arch Posts: 1,037 Rep: hi there, i think this post is asked 1 year ago viewed 172 times active 1 year ago Related 975Check if a program exists from a Bash script625Converting string to lower case in Bash shell scripting1Syntax error with http://gatoisland.com/syntax-error/bash-expr-substr-syntax-error.php Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the

Quote: set -A folders horizon mysteryshopper rcc reference echo ${folders[@]} for i in ${folders[@]} This works the same and imho is easier to read and easier to type: Code: for i Surprisingly among these errors only once I'm getting correct count outputs for the case, where the source folder contains only single data file.

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